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Features

H.M.S. Polyphemus

The Polyphemus

The Canal System of New York

Introduction

The Bollee Steam Carriage

Annular Wheels

Forms of Epicycloidal and Involute Teeth for Inside Gear—Failure of the Odontographs to Meet Certain Practical Cases

By C. W. MacCord

Farquhar's Filtering Apparatus

The Old Aqueducts of Paris

Heat in Relation to Chemical Action

By Henry Allen

Suggestions about Stuffing Cushions

A Simple Equatorial

Hylozoic Materialism

By Robert Lewins

Voss's Induction Electrical Machine

The Pressure of Wind

The Chemical and Physical Effects of Fillings Upon Teeth

By Charles Mayr

Theory of Thermo Electric Motive Forces

By M. Pilleur

Modification of Anesthetic Methods

Rheumatism

By M. P. Geeensword

On Harvesting Machinery

By E. Samuelson

Ensilage

To Keep Very Shaded Places Green

Saddle Horses

Fossil Saiga-Antelopes

Natural History of Butterflies

Land Snails

Jottings about Snakes

Cane Sugar from Molasses

By U. Gayon

Disinfection by Nitrous Oxides

Tanning

By K. Sadlow

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July 30, 1881

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