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Features

Value of Rare Earths for Electrical Purposes

Large Powder Chambers and Gun Erosion

Perhydrase Milk-A New Sterilized Milk

Climate: Past and Present

Recent Performances of the French Airship "Patrie"

By the Paris Correspondent of the Scientific American

The Yawning Cure for Throat Diseases

Facts about Black Lead Pencils

By Katherine B. Calhoun

The Current Supplement

Recent Progress in Wireless Telephony

By Reginald A. Fessenden

The Launch of the "Satsuma"

A Machine that Predicts Tides

By D. A. Willey

Opening of Electric Service on the New York Central and the New Haven Railroads

Some Facts about Tea

By L. Lodian

Snow Shoes for Wagons

Patent Department

An Improved Self-Oiling Roller Bearing

Umbrella Frame with Detachable Ribs

A Handy Portable Crane and Hoist

By A. Frederick Collins

An Improved Receiver for Telephones

Liquid Soap Holder

Departments

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    Correspondences

  • Recently Patented Inventions

  • Notes and Queries

  • Index of Inventions

  • New Books, Etc.

  • Patents

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January 19, 1907

Beyond XX and XY

Biology. Identity. Equality.