Feature

First Glances at New Books

Rescued Swallows Return to Home in Germany

Found: Most Important Missing Link

Nature Ramblings: Hawk-Moth

Finding of Arrow Head near Mammoth Bone Raises Query

Genes, Once Hypothetical, Now Seen and Photographed

X-Rays of Liver Possible through Chemical Injection

Front Matter

Electrically Produced Fever Relieves Asthma Sufferers

Vaccines Used against Germs Which Produce Rheumatism

Yellow Fever Susceptibility Determined by New Test

Secret of Photosynthesis Baffling to Scientists