Feature

“Wallace’s Line”: “A Classic of Science”

German Nationalism Danger to World’s Great Scientists

Front Matter

[Photograph]: Automatic Chemistry Experiment

Warms Sap to Find Its Rate of Flow

Densest Star Found Brighter than Formerly Supposed

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

New York to Have Third Planetarium

Punishment Isolates Children from Parent Who Disciplines

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

Values of Family Life in Soviet Challenged

First Glances at New Books