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American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

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TABLE OF CONTENTS.

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.-

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