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Features

Inorganic Complexes

The Structure of Mineral Compounds Containing a Large Number of Atoms

By Jos*amp*eacute; Rodriguez Mourelo

Water Power in California

The Factors on which it Depends, and the Extent to which it might be Utilized

By Andrew H. Palmer

“All Wool and a Yard Wide”

“Flying Sickness”

A Discussion of its Cause and the Best means of Combatting it

By Lieut.-Col. Martin Flack

Photographic Permanence

The Distinction between the Print that Lasts and the Print that does Not

By C. Welborne Piper

An Apparatus for Growing Crystals under Control

By J. C. Hostetter

The Portable Scoop Conveyor

The Present Last Word in the Transfer of Bulk Materials

The Fight against the Cattle-Tick

How Half of our Quarantined Area has been Freed of this Pest

Manganese in Egypt

Two Fur Seal Problems and their Solution

Academic Secretary of Stanford University

By George Archibald Clark

Radio Telephony—II

Naval and Airplane Installations Developed During the War

By E. B. Craft and E. H. Colpitts

Bitter Sweets

Playertype Photo Copying Process

Radium vs. Meso-Thorium in Luminous Paints

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    April 26, 1919

    Think Outside the Gift Box