Feature

Beautiful New Waterfalls in Africa

Latest Knowledge of Plants Reported

“Ruins” of Nature

Train Dispatchers with Shifting Eyes

Nature Ramblings: Frigates of the Air

Hrdlicka Studies Original Eskimos

Psychologist Teaches Cats to Love Rats

Splitting Seconds with the World’s Newest Clocks

Front Matter

New Device to Measure Ceiling

Cottonseed, Cheap Pellagra Preventive

Strictly American