Feature

How Heavy Is a Mountain? “A Classic of Science”

Yellow Fever Susceptibility Determined by New Test

Reactions of Normal Eyes Timed with Movie Camera

Iodine from Oil Brines Breaks Former Monopoly

Modern Indians Surpassed by Monte Alban Jewelers

Synthetic Hormones May Be Too Pure to Be Effective

Front Matter

New Kind of Atom Smashing Liberates Millions of Volts

Land Animals Small When Coal Was Forming

Bacteria Exploded in Making of New Type of Vaccines

Navy Airplanes to Be Free of Carbon Monoxide

Encouraging Fit Parents to Bear Children Advised