Feature

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

30,000-Ton Rock Worried Prehistoric Engineers

Warms Sap to Find Its Rate of Flow

Electrical Gage Measures Springy Rubber Articles

Magneto-Optic Method Measures Minute Amounts

Nature Ramblings: Yankee Mockingbird

German Nationalism Danger to World’s Great Scientists

Swiss Adds Iodine to Garden to Prevent Goiter in Family

Densest Star Found Brighter than Formerly Supposed

Alabama Expedition Finds 40 Unknown Indian Sites

Earthquake Shakes Aleutian Islands

First Glances at New Books