CONTENTS

Address of the President Before the British Association	561
The Bubonic Plague	576
Gasoline Automobiles	593
Some Scientific Principles of Warfare	605
Modern Mongols	618
Religious Beliefs of the Central Eskimo	624
Mental Energy	632
Chapters on the Stars	638
Discussion and Correspondence	660
Scientific Literature	662
The Progress of Science	664
Index	669

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THE
POPULAR SCIENCE
MONTHLY

EDITED BY
J. McKEEN CATTELL

VOL. LVII
MAY TO OCTOBER, 1900

NEW YORK AND LONDON
McCLURE, PHILLIPS AND COMPANY
1900

Copyright, 1900,
By McCLURE, PHILLIPS AND COMPANY.

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561

THE
POPULAR SCIENCE
MONTHLY.

OCTOBER, 1900.

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ADDRESS OF THE PRESIDENT BEFORE THE BRITISH ASSOCIATION.A
By Sir WILLIAM TURNER, F. R. S.,
UNIVERSITY OF EDINBURGH.

Twenty-seven years ago the British Association met in Bradford,not at that time raised to the dignity of a city. The meetingwas very successful, and was attended by about two thousand persons—aforecast, let us hope, of what we may expect at the presentassembly. A distinguished chemist, Prof. A. W. Williamson, presided.On this occasion the association has elected for the presidentialchair one whose attention has been given to the study of an importantdepartment of biological science. His claim to occupy, however unworthily,the distinguished position in which he has been placed, rests,doubtless, on the fact that, in the midst of the engrossing duties devolvingon a teacher in a great university and school of medicine, hehas endeavored to contribute to the sum of knowledge of the sciencewhich he professes. It is a matter of satisfacti

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