Feature

Cold Essential to Growth of Northern Wild Flowers

Spray Drying Produces Tiny Bubbles of Milk

First Glances at New Books

Marihuana Weed Grows Where Rope Factory Failed

This Unpleasant Widow Is Still an Old Maid

Nasal Spraying Seems Best Hope of Preventing Polio

Mass of New X-Particles May Have a Wide Range

Alcohol, Ether, Exposure Lower Pneumonia Resistance

Cause of Scarlet Fever Believed to Be Virus

Secret of Sex Determination Sought with X-Ray Studies

Vitamin $text{B}_{1}$ May Be Fundamental Component in Evolution

$1,000 AAAS Award Given for Paper on Root Pressure