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Is the Atomic Bomb an Absolute Weapon?

P. M. S. Blackett maintains it is not, and derives therefrom some unusual conclusions. A reply to his argument follows on page 16

By P. M. S. Blackett

A U. S. Physicist's Reply to Professor Blackett

Challenging the Briton's strategic assumptions, he argues that a sudden air attack on military objectives would be decisive in any future war

By Louis N. Ridenour

The Alarm Reaction

Investigators at the University of Montreal have observed physiological changes in animals subjected to stress. Do similar changes take place in the harassed human animal?

By Niall Carey and P. C. Constantinides

Cosmic Rays

On its majestic journey through space the Earth passes through a harsh rain of atomic particles. Presenting a brief review of what is now known about the phenomenon

By George W. Gray

The Ancestors of Mammals

In the Permian and Triassic Periods lived the therapsids and the ictidosaurs, a curious group of reptiles with many mammalian characteristics

By Edwin H. Colbert

The X-Ray Microscope

It does not exist, but the fundamental problem has been solved. When a practical model has been built, it will open some doors closed to electrons and light

By Paul Kirkpatrick

Chemical Warfare Among the Plants

Cooperation and competition are familiar institutions of the plant kingdom. Some plants make use of a form of antisocial behavior to inhibit their competitors

By James Bonner

The Influence of Albert Einstein

This month he is 70. It is an appropriate time to reflect on his achievements and to consider the present state of the work he began in 1905

By Banesh Hoffmann


  • 50 and 100 Years Ago: March 1949

  • Science and the Citizen: March 1949

  • Letters

    Letters to the Editors, March 1949

  • Recommended


  • Amateur Scientist

    The Amateur Astronomer

  • Departments


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