CONTENTS

[Chapters on the Stars]227
[Preventive Inoculation. (II.)]240
[Colonies and the Mother Country. (II.)]248
[Technical Education at the Massachusetts Institute of Technology]257
[The Psychology of Crazes]285
[Some Phases of the Earth’s Development in the Light of Recent Chemical Research]295
[A Preliminary Account of the Solar Eclipse of May 28, 1900, As Observed by the Smithsonian Expedition]302
[Malaria and the Malarial Parasite]310
[New Sources of Light and of Röntgen Rays]318
[Discussion and Correspondence]323
[Scientific Literature]327
[The Progress of Science]332

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.

PRESIDENT G. K. GILBERT,

American Association for the Advancement of Science.

THE
POPULAR SCIENCE
MONTHLY.

JULY, 1900.

CHAPTERS ON THE STARS.
By Professor SIMON NEWCOMB.