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I. BIOGRAPHY.--The New Statue of Philip Lebon.--Biography of
the French pioneer inventor of gas lighting, with notes on
the recent inauguration of his statue.--1 illustration. 9757
II. CHEMISTRY.--The Analysis of Urine.--An elaborate investigation
of the method of analyzing chemically and microscopically
this fluid, with illustrations of the apparatus employed.--4
illustrations 9758
III. ELECTRICITY.--Electrical Alarm for Pharmacists.--An apparatus
for indicating to the pharmacist when he removes from the
shelf a bottle containing poison.--2 illustrations. 9753
Electric Steel Railways.--By GEORGE W. MANSFIELD.--A full
discussion of the problem of electric railways; comparison
with horse and cable traction. 9752
IV. ENGINEERING.--Improved Oscillating Hydraulic Motor.--A
small motor for household use, as for driving sewing machines
and other domestic machinery.--8 illustrations. 9751
The Ceara Harbor Works.--A remarkable engineering work now
in progress in Brazil; the formation of an artificial
harbor.--4 illustrations. 9752
V. GEOLOGY.--Notes of a Recent Visit to Some of the
Petroleum-Producing Territories of the United States and
Canada.--By BOVERTON REDWOOD, F.I.C., F.C.S.--The second
portion of this valuable paper, treating more particularly
of Canadian petroleum. 9765
VI. METEOROLOGY.--The "Meteorologiske Institut" at Upsala,
and Cloud Measurements.--The methods used and results
attained in the famous Upsala observatory under Profs. Ekholm
and Hagström; the measurement of clouds.--1 illustration. 9764
VII. MISCELLANEOUS.--Drawing Instrument for Accurate Work.--By
J. LEHRKE.--A magnifying instrument for fine work and
measurements.--2 illustrations. 9754
Liquid and Gaseous Rings.--Notes on the production of vortex
rings.--The different aspects and breaking up of smoke
rings.--6 illustrations. 9760
Scenes among the Extinct Volcanoes of Rhineland.--The
picturesque features of the geological formations of this
region described.--10 illustrations. 9762
Shall We Have a National Horse?--An eloquent plea by RANDOLPH
HUNTINGTON for the production of a good type of animal.--Use
of the Arabian horse as an improver of the breed. 9760
VIII. NAVAL ENGINEERING.--Trial Trip of the Ohio.--The remarkable
results attained by the introduction of new boilers and
machinery in an American steamship. 9751
IX. PHYSIOLOGY.--Apparatus for Determining Mechanically the
Reaction Period of Hearing.--An interesting study of the time
of transmission of an impulse through the sensor and motor
nerves.--1 illustration. 9753
X. SANITATION.--A New Disinfector.--Description of a new apparatus
for disinfecting by superheated steam and air, with tabular
statement of elaborate tests made with it.--2 illustrations. 9754
Trees from a Sanitary Aspect.--By CHARLES ROBERTS, F.R.C.S.,
etc.--The sanitary value of trees considered by this eminent
sanitarian.--The uses and abuses of shade near houses. 9765
XI. TECHNOLOGY.--A New Alkali Process.--The Parnell & Simpson
process of making carbonate of soda, combining the features of
the Leblanc and ammonia methods. 9755
A New Process for the Distillation and Concentration of Chemical
Liquids.--By GEORGE ANDERSON, of London.--An apparatus
and process especially adapted to the manufacture of sulphate of
ammonia.--The invention of Alex. Angus Croll described.--1
illustration. 9757
Barlow's Machine for Moulding Candles.--A new apparatus for
candle manufacture, fully described and illustrated.--5
illustrations. 9754
Temperature of Gas Distillation.--The mooted question discussed
by Mr. WM. FOULIS, the eminent gas engineer. 9756
The Largest Black Ash Furnace in the World.--Note of a recent
furnace for use in the Leblanc process of soda manufacture. 9756
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