Feature

An Ape for a Baby Sister

Valuable Chemical to Be Extracted from Seawater

Nature Ramblings: Hospitality to ‘Hoppers

First Glances at New Books

Using American Photos, Britons Find Double Weight Neutron

Front Matter

Discoverer Tells How He Found Stellar Flareup

Ancient Aztec Capital Being Dug out beneath Mexico City

Free of Ice, Northern Lands Appear to Be Tilting

Roosevelt Appoints Science Advisory Board

Decade’s White Plague War Adds Year to Average Life

Heavy Water Prevents Seeds from Sprouting