Feature

Is Man Doomed to Extinction?

Front Matter

Peru Restricts Exports of Rotenone Plants

Find Fossil Horse of Pliocene Period

First Glances at New Books

New Instrument Maps Shoal Bottoms Rapidly, Accurately

Organize Clearing House for Heavy Water Research

Nature Ramblings: Old Corvie

Genes Traced to Individual Chromomeres in New Research

[Photograph]: Changing to Winter Clothes

In Science Fields

Back Matter