Feature

Back Matter

[Photograph]: Frontiers of the Shadow

Study of Nova Hastened before It Fades Again

Twin-Training Experiments May Be Great Historic Event

Strong Fortress of Incas Unearthed in Peru

Nature Ramblings: Maldistribution of Water

Accidents Killed 99,000 Persons during 1934

First Glances at New Books

Front Matter

Long-Distance Plane Flights Will Go to High Altitudes

[Photograph]: Great Altar

Six Hundred Billion Volt Cosmic Rays Predicted