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Properties of Water and Ice at High Pressures—II

Five Different Kinds of Ice Discovered

By P. W. Bridgman

A Working Erosion Model

To Illustrate the Influence of Vegetation in Checking Erosion

The Research Chemist and the Textile Industry

By W. P. Dreaper

Sintered Iron foes Compared, Erosion of Canal Bottoms by Boat Propellers

Experience With Two Important Processes and Data as to Costs

The Development of Electrically Operated Tools

Plate-bending Rolls and Hole-cutting Machines Designed at South Bethlehem

By Frank C. Perkins

Notes on Invisible Light

By W. R. Whitney

Recent Discoveries in Physical Science—III

Chemical Valency Bonds Interpreted as Electric Lines of Force

By J. J. Thomson

Experimental Evidence of Molecular Structure


How the Heart is Made to Register its Own Action by the Electricity it Generates

By Hans Guenther

A School of Porpoises at the New York Aquarium

The Difficulties Encountered in Bringing the Catch from Cape Hatteras to New York Alive

By C. H. Townsend

The Problem of Three Bodies

A Classic Problem Solved: Its Application to Celestial Bodies Under Mutual Gravitational Attraction

By F. R. Moulton

Some Fallacies About the Gasoline Engine, The Manufacture of Vulcanized Fiber, and more

By E. W. Fraser


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