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Features

Twin-Screw Engine and Boiler

Steam Power in France

Punching Iron

Charring the Interior of Barrels

By William McNurtrie

Pipes for Gas and Other Purposes

The Transmission of Motive Power

Oil-Testing Apparatus

Niagara Suspension Bridge

Improvements Announced Abroad

Action of Various Saline Solutions Upon Metals

By M. A. Wagner

Coleby's Yarn Reel

Steam Excavating Machine

Sir Titus Salt, Bart

New Twisting Machine

Plumas County (Cal.) Gold Mines

Adulterations

By V. Mattison

The Inclined Coal Seams of Dombrowa, Poland

Profitable Gas Works

Poisonous Corn

Mica

Electro-Metallurgy

Concerning Ashes

Chemistry of the Urine

The Coal Tar Colors

Deutsche Chemische Gesellschaft, Berlin

By A. W. Hofmann

A Look into a Living Stomach

New Microscopic Stage Incubator

By H. A. Reeves

Early Symptoms of General Paralysis

Contraction of Blood-Corpuscles Through the Action of Cold

By R. U. Piper

The Retention of Images by the Retina

Paralysis Treated by Nerve Stretching

New Splint for Fore-Arm and Hand

By E. H. Coover

Nest-Building Fish

Habits of Ants

A Trial of Xanthium Spinosum

A Queer Fish

A New Way of Outlining Theatre Scenery

Suggestions for Economical and Ornamental Fences and House-Trimmings

By Paddlefast

Spectra of Metals at the Base of Flames

By M. Gouy

Reproduction of the Portland Vase

Philadelphia Academy of Sciences

Dissolving Silk

Why Fine Gold Floats

The Eagles of Poetry and Prose

By Edward Newman

Sir William Thomson's New Compass

Force and Velocity of the Wind

Bacillus Anthracis

The Ataccia Cristala

Moustac Swallows

The Village Lyceum

A New Anæsthetic Agent

Remarkable Roman Archæological Discoveries

The German Excavations at Olympia

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    April 21, 1877

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