The Popular Science Monthly, September, 1900 / Vol. 57, May, 1900 to October, 1900

CONTENTS

The Modern Occult	449
Birds As Flying Machines	473
Electric Automobiles	479
The Human Body As an Engine	491
Chapters on the Stars	500
The Psychology of Red. (II.)	517
The Expenditure of the Working Classes	527
The Conquest of the Tropics	540
Discussion and Correspondence	546
Scientific Literature	550
The Progress of Science	555

EDITED BY
J. McKEEN CATTELL

VOL. LVII
MAY TO OCTOBER, 1900

NEW YORK AND LONDON
McCLURE, PHILLIPS AND COMPANY
1900

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