I. ENGINEERING AND MECHANICS.--The Panama Canal. By
MANUEL EISSLER. I.--Historical notes.--Spanish Discoveries
in Central America.--Early explorations.--Nicaragua
projects.--Panama railway, etc.
Improved Averaging Machine.
Compound Beam Engine. 4 figures.--Borsig's improved
compound beam engine.
Power Hammers with Movable Fulcrum.--By DANIEL
LONGWORTH. 5 figures.
The Bicheroux System of Furnaces Applied to the Puddling of
Iron. 2 figures.
Gessner's Continuous Cloth Pressing Machine. 3 figures.
Novelties in Ring Spindles. 4 figures.
Improvements in Woolen Carding Engines.
II. NATURAL HISTORY.--Metamorphosis of the Deer's
Antlers.--Annual changes. 9 figures.
Monkeys. By A.R. WALLACE.--Comparison of skeletons of man,
orang outang, and chimpanzee.--Other anatomical resemblances
and diversities.--The different kinds of monkeys and the
countries they inhabit.--American monkeys.--Lemurs.
--Distribution, affinities, and zoological rank of monkeys.
Silk Producing Bombyces and other Lepidoptera reared in
1881. By ALFRED WAILLY, Member Lauriat de la Societe
d'Acclimatation de France.--An extended and important
European, Asiatic, and American silk worms, and other
silk producers.
III. MINERALOGY, METALLURGY, ETC.--The Mineralogical
Localities In and Around New York City and the Minerals
Occurring Therein.--By NELSON H. DARTON.--Chances for
collecting within one hour's ride of New York.--Methods
of collecting and testing.--Localities on Bergen
Hill.--The Weehawken Tunnel.--Minerals and modes of
occurrence.--Calcite.--Natrolite.--Pectolite.--Datholite.
--Apopholite.--Phrenite.--Iron and copper pyrites.
--Stilbite.--Laumonite.--Heulandite.
Antiseptics.
Crystallization and its Effects Upon Iron. By N.B. WOOD.--
Beauty of Crystals.--Nature of cohesion.--Cleavage.--Growth
of crystals.--Some large crystals.--Cast iron.--Influence
of phosphorus and sulphur.--Nature of steel.--Burnt
steel.--Effect of annealing.
IV. ARCHITECTURE, ART, ETC.--The Cathedral of Burgos, Spain.
--Full page illustration from photograph.
Description of Burgos Cathedral.
Photo-Engraving on Zinc and Copper. By LEON VIDAL.
Meridian Line.--A surveyor's method of finding the true
meridian.--By R.W. MCFARLAND.
V. ELECTRICITY, ETC.--Electro Mania. By W. MATTIEU
WILLIAMS.--Example of electrical exaggeration and
delusion.--Early scientific attempts at electro-motors,
electric lamps, etc.
Action of Magnets Upon the Voltaic Arc. By TH. DU
MONCEL. 2 figures.
Volckmar's Secondary Batteries.
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