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




CONTENTS


  Rhythms and Geologic Time                                          339
  The Photography of Sound Waves                                     354
  The Psychology of Red                                              365
  Chapters on the Stars                                              376
  Colonies and the Mother Country (III)                              390
  Causes of Degeneration in Blind Fishes                             397
  The Evolution and Present Status of the Automobile                 406
  Scientific Results of the Norwegian Polar Expedition, 1893-1896    420
  Discussion and Correspondence                                      436
  Scientific Literature                                              439
  The Progress of Science                                            442




  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.




[Illustration: PROFESSOR R. S. WOODWARD,

PRESIDENT OF THE AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE.]




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, June 26, 1900, as the address of the
        retiring President.


Custom dictates that in complying with the rule of the association I
shall address you on some subject of a scientific character. But before
doing so I may be permitted to pay my personal tribute to the honored
and cherished leader of whose loss we are so keenly sensible on this
occasion. His kindly personality, the charm which his earnestness and
sincerity gave to his conversation, the range of his accomplishment,
are inviting themes; but it is perhaps more fitting that I touch
this evening on his character as a representative president of this
body. The association holds a peculiar position among our scientific
organizations of national or continental extent. Instead of narrowing
its meetings by limitations of subject matter or membership, it
cultivates