PUBLICATIONS RECEIVED.

Agricultural Experiment Stations. Bulletins and Reports. Connecticut:

Twenty-second Annual Report, for 1898, Part I, Fertilizers. Pp.

101.--Cornell University: No. 163. Three Important Fungous Diseases of

the Sugar Beet. By B. M. Duggar. Pp. 30; No. 164. Peach-Leaf Cure,

etc. By B. M. Duggar. Pp. 20.--Massachusetts Agricultural College

(Hatch Station): No. 58. Manurial Requirements of Crops. Pp 16.--New

Jersey: No. 135. Poisonous Plants. By Byron D. Halsted. Pp. 28.--North

Dakota Weather and Crop Service, Fifth Annual Report. B. H. Bronson,

section director. Pp. 78; Monthly Reports for October and November,

1898. Pp. 8 each.--Ohio: No. 96. The Army Worm and Other Insects. By

P. M. Webster and C. W. Mally. Pp. 26; No. 97. Some Diseases of Wheat

and Oats. By A. D. Selby. Pp. 32; No. 98. Small Fruits. By W. J.

Green. Pp. 146.--West Virginia: No. 53. Commercial Fertilizers. By J.

H. Stewart and B. H. Hite. Pp. 36.

American Asiatic Association, Journal of the. Vol. I, No. 5. John

Foord, editor. Pp. 16.

Ayer, N. W., and Son. American Newspaper Annual, 1899. Philadelphia.

Pp. 1400.

Berea Quarterly, February, 1899. Berea College, Kentucky. Pp. 28. 30

cents. $1 a year.

Berry, Arthur. A Short History of Astronomy. New York: Charles

Scribner's Sons (University Series). Pp. 440. $1.50.

Bradford, Gamaliel. The Lesson of Popular Government. New York: The

Macmillan Company. 2 vols. Pp. 520 and 590. $4.

Brown, William Harvey. On the South African Frontier. New York:

Charles Scribner's Sons. Pp. 430, with map. $3.

Buckley, Arabella B. The Fairy-Land of Science. New York: D. Appleton

and Company.

Clayton, C. Helm. Studies of Cyclonic and Anti-Cyclonic Phenomena with

Kites. Blue Hill (Massachusetts) Meteorological Observatory. Pp. 15,

with plates.

Force, General Manning F. General Sherman. New York: D. Appleton and

Company (Great Commanders Series). Pp. 353.

Guignet, E., and Gamier, Edouard. La Céramique, Ancienne et Modern

(Ceramics, Ancient and Modern). Paris: Félix Alcan. (Bibliothèque

Scientifique Internationale.) Pp. 311. 6 francs.

Gellé, Le Dr. M. E. L'Audition et ses Organes (Hearing and Its

Organs). Paris: Félix Alcan. (Bibliothèque Scientifique

Internationale.) Pp. 326. 6 francs.

Hancock, James Denton. The Louisiana Purchase treated in its Relations

to the Constitution of the United States and the Declaration of

Independence. Pp. 8.

Herzberg, Henry. True _versus_ False Education. Pp. 20.

Hinsdale, Guy, M. D. Acromegaly. Detroit: William M. Warren. Pp. 88.

$1.50.

International Correspondence School, Scranton, Pennsylvania. Short

Courses in English Branches, Bookkeeping, Stenography, and Mechanical

and Ornamental Drawing. Pp. 16.

Jacobs, Joseph. The Story of Geographical Discovery. New York: D.

Appleton and Company. (Library of Useful Stories.) Pp. 200. 40 cents.

Kingsley, Mary H. West African Studies. New York: The Macmillan

Company. Pp. 633, with maps. $5.

Library Notes, Vol. IV, No. 16. Edited by Melvil Dewey. Simplified

Library School Rules. Pp. 72. Quarterly. 50 cents. $1 a year.

Lille, Société Photographique de. Le Nord Photographie. January, 1899.

(Sixth year.) Lille, France. Pp. 20.

Mason, William P. Examination of Water (Chemical and Bacteriological).

New York: John Wiley & Sons. Pp. 135. $1.25.

Macalaster, The. Monthly. February, 1899. St. Paul, Minnesota,

Macalaster College. Pp. 32. 15 cents. $1 a year.

Parsons, Frances Theodora. How to Know the Ferns. New York: Charles

Scribner's Sons. Pp. 215. $1.50.

Rafinesque, C. S. Ichthyologia Ohioensis; or, Natural History of the

Fishes inhabiting the River Ohio and its Tributary Streams. A reprint

of the original, with life, etc. By R. Ellsworth Call. Cleveland,

Ohio: The Burrows Brothers Company. Pp. 175. $4.

Reprints. Ashmead, Albert S., M. D. No Evidence in America of

Pre-Columbian Leprosy. Pp. 10.--Grant, Sir James. The Alimentary Canal

and Human Decay In Relation to the Neurons. Pp. 8.--Hopkins, Thomas C.

Clays and Clay Industries of Pennsylvania; I, Clays of Western

Pennsylvania (in part). Pp. 183.--Howard, L. O. The Economic Status of

Insects as a Class. Pp. 33.--Jackman, Wilbur S. Constructive Work in

the Common Schools. Pp. 18.

Russell, Frank. Explorations in the Far North. University of Iowa. Pp.

290.

Schiavone, Mario. Il Principio della dirigibilita orizzontalie degli

aerostate ed Binaerostato (The Principle of the Horizontal

Dirigibility of Aërostats and the Binaërostat). Potenza, Italy. Pp.

48.

Schubert, Hermann. Mathematical Essays and Recreations. Translated by

T. J. McCormack. Chicago: The Open Court Publishing Company. Pp. 149.

75 cents.

Scrutten, Percy E. Electricity in Town and Country Houses. Second

edition. New York: The Macmillan Company. Pp. 148. $1.

Sloyd Bulletin No. 2, March, 1899. Boston: Sloyd Training School. Pp.

21.

Smithsonian Institution publications: Annual Report of the Board of

Regents to July, 1896. Pp. 727; do. to July, 1897. Pp. 686.--Bolton,

H. C. A Select Bibliography of Chemistry, 1492 to 1897. First

Supplement. Pp. 489.--Cook, O. F. African Diplopoda of the Genus

Pachybolus. Pp. 10, with plates.

Society of American Authors. Monthly Bulletin. March, 1899. Pp. 16.

United States Commissioner of Education (W. T. Harris). Report for

1896-'97, Vol. II. Pp. 1245.

Veblen, Thorstein. The Theory of the Leisure Class. New York: The

Macmillan Company. Pp. 400. $2.

Waddell, John. The Arithmetic of Chemistry. New York: The Macmillan

Company. Pp. 137. 90 cents.

Wickersham, James. Major Powell's Inquiry, "Whence came the American

Indians?" An Answer. Tacoma, Washington: Allen and Lamborn Printing

Company. Pp. 28.

Writt, Henry. Some Observations on the Fundamental Principles of

Nature. Chicago: P. O., Station N. Pp. 32. 25 cents.

Fragments of Science.

=Death of Professor Marsh.=--Othniel C. Marsh, professor of

paleontology in Yale University, and curator of the geological

collection of that institution, died of pneumonia at his home in New

Haven, Connecticut, March 18th. He had not been in good health for

several years, and succumbed to the effects of a cold which he had

caught before wholly recovering from a previous cold. A sketch of his

life up to that time, embracing the most active parts of his career as

a geological explorer, in which he gained great renown, was given,

with a portrait, in the Popular Science Monthly for September, 1878.

During the period that has intervened he made studies of the results

of his explorations and other geological work, and published papers of

very high scientific value. About a year ago he transferred his

extensive and famous collections at the Peabody Museum to the

university. These collections were among the finest of their kind in

the world, and were especially remarkable for their fossils of immense

animals exhumed from the Western plains. They were greatly admired by

Professor Gaudry, the eminent French geologist, who spoke of them in

terms of high praise in the _Revue des Deux Mondes_ of October 15,

1898. It was through his efforts that the funds were obtained from

George Peabody, his uncle, for the construction of the Peabody Museum,

a part of which has been built. His health having apparently improved

for a few months previous to his death, he had been working with

renewed activity at the museum, and had recently written articles on

paleontological subjects. Having considerable means of his own, he

served the university without salary, and carried on his explorations

mostly at his own cost, paying large sums to assistants and for other

items in the work. He left ten thousand dollars to the National

Academy of Sciences, of which he was one of the founders and was for

several years president, and all of the rest of his estate, estimated

to be worth nearly one hundred thousand dollars, to Yale University.

=Popular Co-operation in Health Work.=--In a review of A Quarter

Century of Public Health Work in Michigan, Mr. Theodore R. MacClure,

chief clerk of the State Board of Health office, says that experience

in the State has indicated that it is necessary to have the

co-operation of the people if the dangerous communicable diseases are

to be restricted and prevented. In order to accomplish this result,

the State Board of Health has published leaflets relating to the modes

of spreading and the best methods for the restriction and prevention

of such diseases. These leaflets have been printed by tens of

thousands, and whenever a dangerous disease is reported to the central

office several copies of the leaflet relating to the disease in

question are usually sent to the local health officer. He is requested

to place one of these instructive publications with the family where

the disease exists, and a copy with each neighbor of the infected

premises. The instruction comes at a time when people are interested

to know about the disease in question, and in this way their general

co-operation is sought and secured. Citizens are thus educated and

become familiar with their duties in the premises, are taught wherein

the dangers lie and how to avoid them, and are prompted by the

strongest considerations to do their part in the matter.

=Death of Prof. Oliver Marcy.=--Dr. Oliver Marcy, professor of natural

science in Northwestern University, who died February 19th, in the

eightieth year of his age, was a native of Coleraine, Massachusetts;

was graduated from Wesleyan University in 1846, became teacher of

mathematics in Wilbraham Academy, Massachusetts, and later professor

of geology, etc., in that institution. In 1862 he was appointed

professor of geology in Northwestern University, Evanston, Illinois,

but taught in addition, at times, other branches of science and even

some branches in other lines. He was twice acting president of the

university. In conjunction with Prof. Alexander Winchell, he prepared

a monograph on Fossils from the Niagara Limestone of Chicago, which

was read to the Boston Society of Natural History. In 1866 he was

naturalist to a Government expedition to the Bitter Root Mountains in

Idaho and Montana, in which he collected scientific material, and of

which he published an account in 1867. He wrote papers concerning the

geology of the shore of Lake Michigan and of the region about Chicago;

brought two fossil trees found in the university grounds to scientific

notice; and contributed considerably to geological publications. He

was curator to the natural history collection of his university for

nearly thirty years. Two fossil species and a mountain in Montana have

been named after him.

=Which is the Fittest to Survive?=--Prof. A. W. Rücker spoke in his

opening address at the recent meeting of the International Magnetic

Conference in Bristol, England, of what seems to be a law of Nature,

that the products of an organism are fatal to itself; in accordance

with which, he said, pure science is threatened by the very success of

its practical applications. The smoke of our cities blots the stars

from the vision of the astronomer, and now the science of terrestrial

magnetism is threatened by the artificial earth currents of the

electric railway. Prof. W. E. Ayrton, in his welcoming address, took

another view of the subject and answered the reference the electrical

engineers make to the principle of the survival of the fittest when

they are told of the ruin their wires are bringing upon magnetic

observatories--"So much the worse for the observatories"--"Can the

system of electric traction that has already destroyed the two most

important magnetic observatories in the United States and British

North America be the best and fittest to survive? Again, do we take

such care and spend such vast sums in tending the weak and nursing the

sick because we are convinced that they are the fittest to survive?

May it not be perhaps because we have an inherent doubt about the

justice of the survival of the strongest, or perhaps because even the

strongest of us feels compelled modestly to confess his inability to

pick out the fittest, that modern civilization encourages, _not_ the

destruction but the preservation of what has obvious weakness, on the

chance that it may have unseen strength? When the electrical engineer

feels himself full of pride at the greatness, the importance, and the

power of his industry, and when he is inclined to think slightingly of

the deflection of a little magnet compared with the whirl of his

one-thousand-horse-power dynamo, let him go and visit a certain dark

storeroom near the entrance hall of the Royal Institution, and while

he looks at some little coils there, ponder on the blaze of light

that has been shed over the whole world from the dimly lighted

cupboard in which these coils now lie. Then he may realize that while

the earth as a magnet has endured for all time, the earth as a tramway

conductor may at no distant date be relegated to the class of

temporary makeshifts, and that the raids of the feudal baron into the

agricultural fields of his neighbors were not more barbarous than the

alarms and excursions of the tramway engineer into the magnetic fields

of his friends."

=Teaching the Teachers.=--The following suggestive paragraph is taken

from the inaugural address of William Henry Preece, president of the

British Institution of Civil Engineers: "Our educational methods have

begun at the wrong end. We ought to teach the masters first and then

the men. Moreover, we have to teach the teachers and those who have

control of the purse-strings. The County Councils of England are

scarcely qualified as yet to discharge the very serious duty of

properly dealing with a question so few of them understand--though

many of them have tackled the matter manfully, especially the London

County Council, through its Technical Education Board, on which a

large proportion of co-opted experts have seats, who, by supporting

existing institutions, have contributed toward the supply of teachers.

But how are we to approach the masters? A fault once discovered is

halfway to repair. It is difficult to remove the scales from the eyes

of the man who has been successful in business and knows not of his

blindness; but the coming generation will be more enlightened, and the

future masters better educated. We are suffering from a lack of

competent teachers. A teacher who has had no training in the practical

world is worse than useless, for he imparts ideas derived from his

inner consciousness or from the false teaching of his own abstract

professor, which lead to mischief. In my own experience I have met

with very serious inconveniences from this cause. The ideal professor

of pure abstract science is a very charming personage, but he is a

very arrogant and dogmatic individual, and, being a sort of little

monarch in his own laboratory and lecture room, surrounded by devoted

subjects, his word is law, and he regards the world at large,

especially the practical world, as outside his domain and beneath his

notice. He is generally behind the age. These are not the men for

technical institutes. Such teachers should possess the diploma of this

institution."

=The People of India and the Missionaries.=--In the light of three

months' special observation, J. T. Sunderland has reviewed in the New

World Magazine the prospects of the success of Christian missions in

India. There are several causes that hinder their progress, among

which the author mentions as more important the number of Christian

sects and denominations; the character of the doctrines preached, in

that in many aspects they do not appeal to Hindu or Mohammedan faith

or modes of thought, and in some contradict them, and as to those

points are a serious hindrance to the progress of Christianity; and

the vices of many Europeans, creating a prejudice against their

professed religion that is not wholly contradicted by the testimonies

and examples of the missionaries and men of nobler stamp. To the last

objection the answer is easy, though it may not always be convincing,

that these wicked men sin not because they are natural products of

Christianity, but because they disobey it. A strong factor in

disarming prejudice against Christianity and winning favor for it is

the fact that through it, directly or indirectly, certain very

important kinds of good are coming to India--education, schools,

books, science, invention. The contact of India with Christian lands,

civilization, thought, and life, is steadily telling upon Indian

thought. Further, "it is to be said to the honor of all the Protestant

missions of India, at least, of whatever name, that they are helping,

instructing, and lifting up the lower classes, and offering them hopes

and prospects such as they could not have had under their old faiths.

This is much, very much." The very presence of the missionary in a

community is likely to be an enlightening influence. He is a man of

more than common education, and "has brought with him to India

something of the thought, the culture, the ideals of life, the habits

and customs of the Western world. He introduces higher standards of

living. He gives his influence in favor of better public sanitation,

better homes for the people, better streets and public buildings,

better public improvements generally. His home and family life, in

which the wife receives the same consideration as her husband, and the

daughters are educated with the same care as the sons, becomes a

valuable object lesson in the community where he dwells." The missions

as a whole are regarded by the author as an important factor in a

great religious evolution. The precise form and direction which this

evolution will take seem to be a matter yet to be determined.

=Weeds under Cultivation.=--For several years past the botanical

department of Michigan Agricultural College has maintained a "weed

garden," and has grown a hundred or more species of the most

troublesome weeds in plots. Some curious results from the experiments

are recorded by Prof. W. J. Beal in a paper read at the meeting, 1897,

of the Society for the Promotion of Agricultural Science. The most

vigorous and aggressive weeds seem to take on under cultivation the

weakness and capriciousness of delicate cultivated plants. "It is very

instructive," Professor Beal says, "to note how much better many of

these plants thrive when they get away from the spot where they have

been confined for from two to several years. Seedlings of Jamestown

weed were larger in the plantain bed than in their own. After three

years the plantain nearly ran out and _Amaranthus albus_ entirely

disappeared. One species of pigweed grew finely for two years, but

afterward made a small display; and another variety did not seem very

persistent for a plant that ranked among the weeds, but shied off from

its home ground 'as if searching for fresh fields.' Barnyard grass

(_Panicum crusgalli_) behaved like pigweed, and 'needed considerable

attention.' The little round-leaved mallow, which roots deeply about

rubbish piles in mellow soil, was grown of respectable proportions in

the garden with considerable difficulty, and with no more ease in the

bottom lands of other parts of the botanic garden. Considerable pains

is required every year to keep on hand even fairly well-grown

specimens of mullein. Knotgrass, which thrives with abuse and seems to

enjoy trampling by feet, was grown with difficulty in the plots.

'Insects prey upon it; rust causes it to dwindle and disappear.'

'Motherwort grows rank four feet high near the barnyard fence, and the

flowers are covered with bees, but when kept several years in the same

bed it goes off into the sulks as though neglected.' Shepherd's purse

is often disturbed by a parasitic fungus, and it is difficult to grow

nice plants long in the same place. Cocklebur, if found long in the

same spot, is troubled sadly with a mildew, and more recently also

with a rust."

=Operations against Woodchucks.=--Prof. F. H. Storer records in the

Bulletin of the Bussey Institution, Harvard University, the results of

his experiments in the destruction of woodchucks, which, besides being

very injurious to lands he had under cultivation, appeared to be

increasing. Smothering by a volatile liquid driven into the burrow has

been suggested by Professor Hilgard, who recommends bisulphide of

carbon. Professor Bussey finds that liquid not wholly satisfactory and

liable to objections, and prefers a preparation of naphtha or other

volatile liquid. In any event, some device seems to be needed for

forcing a considerable quantity of the vapor into the very end of the

burrow. Poisons are dangerous because of the probability that the

animal would bring the food on which they are placed to the mouth of

the burrow for eating, where children or useful animals might get it.

While experimenting with burning Cayenne pepper or sulphur on touch

paper, in order to smoke out the burrows, the author became acquainted

with the "woodchuck torches" of Mr. B. M. Wedger, of Roslindale,

Massachusetts. These consist of nitrate of soda, sulphur, mealed

gunpowder, and sulphide of antimony, so packed into a tube like a

Roman candle that on burning the fuse the vapors would be forced by

great pressure to the farthest recesses of the burrow. They proved

effectual, and it was indeed rare that any woodchuck to which they

were applied ever reported himself again. Professor Storer also

describes some experiments he made in burning sulphur in the burrows,

with special expedients for insuring more rapid and perfect combustion

of the sulphur; these promised fairly well. Mr. Henry Stewart has

described in the Country Gentleman an effectual method of destroying

woodchucks with blasting powder or dynamite.

=Evolution in Lamps.=--The story of lamps from Herodotus down to 1830,

Mr. Henry C. Mercer says, in an instructive study on Light and Light

Making in the contributions of the Bucks County (Pa.) Historical

Society, is not one of development. In principle and form they remain

the same, whether as the tin cylindrical or boat-shaped cups on

candlestick pedestals and the round tin cups with hemispherical lids,

or the lidless cups resting on wooden stands such as were recently

rescued by the author from the garret rubbish of old Bucks County. And

before Herodotus, as we follow the lamp back into the tombs of the Old

World, we find the boat-shaped form of earthenware preceding the

boat-shaped form of iron and possibly even that of bronze. The

chalk-cup lamp found by Canon Greenwell in the neolithic flint mines

at Grimes Graves, England, perhaps the oldest wick-floating lamp in

the world, is not essentially different from the oyster shell filled

with lard and provided with wicks that may be found among Virginia

negroes to-day. The Egyptian, Grecian, Phoenician, and Roman lamps, as

they have been found in the tombs and as we see them in the museums,

are not unlike the lard lamps that were most in use early in the

nineteenth century. Then crude grease gave way to sperm oil and lard

oil, with especial adaptations of the lamps that made them more

convenient and improved the light; and burning fluids that were

convenient and clean and gave a brilliant light, but were dangerous;

and kerosene, with other improvements in the lamps and refinements in

the oil that enabled it to give the most perfect artificial light yet

found and to keep up the fight for quality with gas and

electricity--all these having come in within the life-time of men

still among us. Besides the old lamps, our ancestors had candles,

molded when the price of tin, the material for the molds, did not

forbid the luxury, and before them tallow dips; a suspended wick was

dipped into a pot of hot tallow, on a cold day, and the operation was

repeated till layer after layer of grease hardened, and the candle was

thick enough. These candles were, however, troublesome in hot weather,

on account of their propensity to yield to the temperature and fall

over. "Who shall say, however, that candle-dipping is older than

molding, when we know ... that they molded candles in County Galway,

Ireland, in late years by punching holes in peat and pouring in tallow

on the down-hung wick of twisted flax fiber?" The Irish had, too, as

had the negroes, the rush light, a greased rush set in a hole in a

wooden block serving as a candlestick; or rushes joined in a triple

twist which flies apart when lighted, increasing the blaze. From this

Mr. Mercer passes to forms of candlesticks and torches and cressets

and methods of producing fire, whither we can not follow him, for the

multitude of details he notices, which will not bear abstracting.

=Inconsistent Philozoists.=--In his address at the opening of the

physiological and pathological laboratories at Belfast, Ireland, Lord

Lister took occasion to give some illustrations, drawn from practice,

of the value of pathological research. "There are people," he said,

"who do not object to eating a mutton chop--people who do not even

object to shooting a pheasant with a considerable chance that it may

be only wounded and may have to die after lingering in pain, unable to

obtain its proper nutriment--and yet who consider it something

monstrous to introduce under the skin of a guinea-pig a little

inoculation of some microbe to ascertain its action. These seem to me

to be most inconsistent views. If these experiments upon the lower

animals were made for the mere sport of the thing, they would be

indeed to be deprecated and decried; but if they are made with the

wholly noble object of not only increasing human knowledge, but also

of diminishing human suffering, then I hold that such investigations

are deserving of all praise. Those little know who lightly speak on

these matters how much self-denial is required in the prosecution of

such researches when they are conducted, as indeed they always are, as

far as I am aware, with the object of establishing new truth."

=The Ruins of Xkichmook, Yucatan.=--The group of ruins in Yucatan

called Xkichmook was discovered by Mr. Edward H. Thompson in 1888,

when he read a paper before the American Antiquarian Society embodying

his first impressions of it. He has since made studies of it extending

over a period of seven years. The group is about one hundred and forty

miles south of Merida and forty or fifty miles east of Campeche,

situated in a narrow valley between a series of rocky hills, and has

to be approached by precipitous paths over the hillsides, and thence

down the beds of dry _arroyos_ whose yearly freshets wash away all

vegetation. Ten buildings, including one called the Palace, and two

mounds were explored, and some miscellaneous excavations were

made--all of which are described in the author's paper (Field

Columbian Museum), with figures of the buildings and objects. Pottery

and flaked stone implements were plentiful, but polished implements

and specimens of sculpture were exceedingly rare. The flat under

surfaces of the ceiling stones of the vaulted chambers seem to have

contained very elaborate designs; in another chamber portions of a

painting were still partly preserved; in another, curious drawings or

glyphs in strong black lines once existed; in another was a painted

human figure, of which only the flowing headdress, a portion of the

face, and certain devices issuing from the mouth and probably

indicating speech, now remain. The mysterious red hand was found

painted in various places, and in one a human hand in blue pigment was

found, the impression of which was so fresh and perfect in places that

even the minute lines of the skin were visible. In ten years of

investigation among the ruins of Yucatan and Campeche not as many

specimens of worked obsidian were found as could be picked up in half

an hour among certain Mexican ruins; but traces of ancient fabrication

of flint implements were more plentiful than anywhere else.

=The Seventeen-Year and the Thirteen-Year Locusts.=--The periodical

cicada, or seventeen-year locust, as it is called, is distinctly

American, and has the longest life period of any known insect. It is

especially remarkable, Mr. C. L. Marlatt observes in his memoir upon

it, in its adolescent period, the features of particular divergence

from other insects being its long subterranean life of thirteen or

seventeen years, and the perfect regularity with which at the end of

these periods every generation, though numbering millions of

individuals, attains maturity almost at the same moment. At this

moment the brood issue from the ground, leaving innumerable exit

holes, and swarm over trees and shrubs, filling the air with their

strident calls, and laying their eggs in slits which they cut in the

trees. The larvæ, when hatched, fall to the ground, and quickly burrow

out of sight, each "forming for itself a little subterranean chamber

over some rootlet, where it remains through winter and summer, buried

from sun, light, and air, and protected in a manner from cold and

frost.... It lives thus alone in its moist earthen chamber," rarely

changing its position unless some accident to the nourishing rootlet

may necessitate its seeking another, passing the thirteen or seventeen

years of its hypogeal existence in slow growth and preparation for a

few weeks only of winged life in the air and light. Other cicadas

appear every year, usually in comparatively small numbers. They are

probably equally long in maturing, but the periods of their lives have

from some cause or another been cast in "off" years. The thirteen-year

broods are southern, and the shortening of their periods of

development may possibly be accounted for by the longer season of

warmth in the southern year giving them the number of hours or of

aggregate degrees of warmth in thirteen years that the more northern

broods can not receive in less than seventeen years. This, however, is

only speculation, and there are difficulties in applying the

supposition to make it fit all the facts; and many believe that the

two races are specifically different. The late Prof. Charles V. Riley

distinguished twenty-two different broods of cicadas in the United

States, seven of which appertain to the thirteen-year period (_Cicada

tredecem_).

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