Feature

200,000,000-Year-Old Track Tells Tale of Insect Tragedy

New Electric Roof of World Found by American Physicists

Big Tree of Tule Re-Examined; Claimed as World’s Greatest

400,000-Year-Old Tools Found in Sand Beds

American Negroes Came from Small Part of Vast Africa

First Glances at New Books

Front Matter

Protons Seen as Source of New Atomic Particles

Galileo on Falling Bodies: “A Classic of Science”

Economy Axe Falls Heavy on U. S. Bureau of Standards

Values of Family Life in Soviet Challenged

Nature Ramblings: The Nymphs’ Flower