Transcriber’s note: Table of Contents added by Transcriber.

CONTENTS

Rhythms and Geologic Time339
The Photography of Sound Waves354
The Psychology of Red365
Chapters on the Stars376
Colonies and the Mother Country (III)390
Causes of Degeneration in Blind Fishes397
The Evolution and Present Status of the Automobile406
Scientific Results of the Norwegian Polar Expedition, 1893–1896420
Discussion and Correspondence436
Scientific Literature439
The Progress of Science442

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.


PROFESSOR R. S. WOODWARD,

President of the American Association for the Advancementof Science.


339

THE
POPULAR SCIENCE
MONTHLY.

AUGUST, 1900.


RHYTHMS AND GEOLOGIC TIME.A
By G. K. GILBERT,
UNITED STATES GEOLOGICAL SURVEY.

A Read to the American Association for the Advancement of Science, at New York, June26, 1900, as the address of the retiring President.

Custom dictates that in complying with the rule of the associationI shall address you on some subject of a scientific character. Butbefore doing so I may be permitted to pay my personal tribute to thehonored and cherished leader of whose loss we are so keenly sensible onthis occasion. His kindly personality, the charm which his earnestnessand sincerity gave to his conversation, the range of his ac

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