Feature

British Report Most Potent Form of Vitamin D Yet Known

Present Geyser Action Theory Needs Changing

Biting Birch Bark Designs Was Indians’ Lost Art

Trees Will Die Unless Heavy Rains Fall

Ball Lightning, Old Puzzle to Science, Made out of Smoke

Soporific Drug Numbs Brain but Goes Chiefly to Muscles

Nature Ramblings: Deep Sea Drama

Universe Rushing Outward May Be Optical Illusion

First Glances at New Books

Ink Absorbing X-Rays Aids in Identification

Bubbling Sand Separates Coal from Heavier Slate

Nature Ramblings: Potted Plants