Feature

Cockroaches Get along without Any Vitamin A

Nature Ramblings: War and Whaling

Too Much Vitamin D, Calcium Hinders Healing of Bones

First Glances at New Books

Front Matter

Ultraviolet Barrages Urged as Means of Preventing Flu

Power Is Sent by Radio with New “Klystron Tube”

Nerve-Cutting Operation Cures Meniere’s Disease

[Photograph]: Won’t Burn

U. S. Army May Eat Bread Enriched with Morale Vitamin

Air Raid Noise Not Likely to Harm Nervous System Cells

Endurance of Loss of Sleep Tribute to Londoners’ Stamina