Feature

Stone Age Men Made Tools of Rock Crystal

Research Hailed as Means to Save Railroad Lines

Airplanes Spot Breaks in Electric Power Lines

Movies of Great Service in Study of Children

Insects Active on Many Battlefronts Until Frost

Front Matter

Nobel Chemistry Award to German Industrial Leaders

Bear with Bell Proud Although Ostracized

Instrument Indicates When Chicle Tree Should Be Tapped

In Science Fields

Earthquakes: “A Classic of Science”

Three Planets Together from November 17 to 26