Feature

Effect of Glandular Secretions on Sex Discussed by Scientists

Twins That Are Alike and Twins That Are Unlike

First Glances at New Books

“Artificial Cells” Point Way to Greater Knowledge

High-Yielding Corn Bred from Runts

Front Matter

Substitute for Sulfur Vulcanizes Rubber

Man’s Rays Stronger than from Radium Win $1,000 Prize

Theories of Universe Shaken by Discoveries at Harvard

What Science May Make of the World in 2,500 A. D.

Anthropologist Is Elected New A. A. A. S. President

Magnetism Heals Mutilated Flatworms