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A Scientific City

Inside a Lighthouse



By R. Wood Brown

Sagnes' Machine for making Moulds for Objects in Copper and Bronze

Drainage of Large Marshes

By C. E. Hollister

Meinesz's Compressed Air Dredging Apparatus

The Cost of Steam Power

By Charles E. Emery

American and English Freight Cars

The Hull and Barnsley Railway Swing Bridge

Forged Steel Wheels

Ceramic Photography

By A. L. Henderson

The Cable Railways of Chicago.—Some of the Difficulties and Objections to their use in Crowded Cities

Division of the Weight Unit

Relief Printing Blocks from Photographs

The Decay of Building-Stones

The Dendrometer.—An Instrument for Measuring Heights of Trees

Radiguet's Electric Light Apparatus

The Magnetic Balance

By D. E. Hughes

The Baume Hydrometer Scale

By John Tagliabue

The New Morphological Element of the Blood

Notes on New Caledonia

The Eruption of Krakatoa

Rare Fishes

Trout and Trout Culture

By R. A. Koss

Experiments on the Colors of Gems


On the Condensation of Gases


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March 22, 1884

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