Feature

Bubbling Sand Separates Coal from Heavier Slate

Coal in Small Doses Stimulates Plant Growth

Action of Steel under Stress Revealed in Writing on Sand

Discovery Made That Liver Conserves Heat of Body

[Photograph]: Rocky Mountain Reptiles of Sixty Million Years Ago

Front Matter

Universe Pulsating in Cycles Seen by American Scientist

Ink Absorbing X-Rays Aids in Identification

Bacteria May Have Helped in Formation of Anthracite

Pavement Stop Signs Have Letters Shaped Wrongly

American Thanksgiving Plants Fifty Years after Columbus: “A Classic of Science”

Clouds Make Day Bright When Sun Is Partly Hidden