Feature

Man Must Use Brains to Sleep Normally

Birds Excel Man’s Airplanes as Efficient Flying Machines

Tropical Disease of Cattle Gains Foothold in U. S.

Health Officials Act on Methanol Regulation

Nature Ramblings: Solomon’s Seal

New Kind of Toxin May Yield Serum for Many Diseases

Bacteria-Eating Protozoa Thrive Best on Mixed Diet

First Glances at New Books

Front Matter

Parenthood Seems to Depend on Inorganic Manganese

Earth’s Magnets Quiver Day after Outburst on Sun

California Astronomer Chosen National Academy President