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Spruce Creek Tunnel

A Railroad in the Clouds

By J. Eglinton Montgomery

Broad Wheel Tires

The Hoosac Tunnel

Rack-Rail Railways

Russian Torpedo Boats

The One Hundred Ton Armstrong Gun

Nicaraguan Canal

Roots' Mine Ventilator

By E. Hamer Carbutt

Ten Horse Power Engine

The Tides

By Elias Schneider

Fine Water Drops

Capillary Electrometers

Improvement in Electric Lights

By Nicolas Emile Reynier

Edison's Pressure Relay

Red or Green?

European Labor

Physical Society, London

By G. C. Foster

California Academy of Sciences

Statistical Society, London

Frauds on Life Insurance Companies

The Flag, and Other Flags

Forests of Sweden

Process of Applying Oxygenated Air in Blast-Furnaces

By Charles Hornbostel

Mr. Lewis' Freezing Microtome

Sulphurous Castings

Fuel Used to Smelt a Ton of Iron

Chemical Society, London, June 7, 1877

Improvement in Ore-Washers

By Henry E. Taylor

How Steam Increases its Own Heat

Instantaneous Photography

Chemical and Photo Notes

Photo-Lithographic Paper

By J. Husnio

How to Enlarge and Photograph Microscopic Objects

By M. A. Rutot

Prizes Offered by the Vienna Photographic Society

Mounting Photographs

By Walter B. Woodbury

Beet Root and Beet Root Sugar

By Edw. Lefroy Cull

The Prices of Nursery and Greenhouse Products, Abroad and at Home

By Peter Henderson

Haymaking

Japanese Mirrors

How to Make Rubber Hand Stamps

Indian Corn as Food for Man

The Art of Printing

Utilization of Dead Animals

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    August 04, 1877

    Beyond XX and XY

    Biology. Identity. Equality.