Feature

Books of the Week

Leapfrog-Playing Shark Is Reported by Scientist

Blue Dye Saves Patient from Bleeding to Death

Bands on Bats’ Legs Show They Can Live Eight Years

New Machines and Gadgets

Front Matter

New Vitamin B Reported

Meteorites Identified

You Can Hear Your Heart Beating in a Quiet Room

Good Bird Dogs Acclaimed as Aids in Conservation

Soviet Uranium Deposits

U. S. Prosperity Threats