Feature

New Colors in Stone Sought as Relief from Machine Age

The Newer Metals of Group IV: “A Classic of Science”

Tapping of the Atom’s Energy Achieved in New Experiment

Cannibal Grasshoppers Infect Selves with Fungus

Front Matter

Winter Rains to Aid Rangers in Fighting Fires This Summer

Scientists Learning Secret of How Plants Manufacture Food

Extract of Blood-Forming Hormone Checks Anemia

Overdose of Caffein May Cause Sterility in Males

Nature Calendar Shows Outdoor Life for Month

Skin Color Makes Negroes Get Rickets More Easily

Booklists of the A. A. A. S.