Feature

Heated Gypsum Becomes Useful, Thirsty Chemical

Frog Tadpole Tails Successfully Transplanted

Tests of Radio during Eclipse of Sun Urged

Expedition Will Study Sargasso Weed and Flying Fish

Nature Ramblings: Trouble by Threes

First Glances at New Books

Prizes for Discovery of Vitamin Requirements

Front Matter

Accuracy of History Checked by Study of Famous Bones

[Photograph]: Twice Pioneer

Natural Gas Chemical Extracts Lubricant

Broody and Non-Broody Hens Produced by Breeding