NOTE: degrees A (Absolute?) is the same as the current
degrees K (Kelvin).





THE POPULAR SCIENCE MONTHLY VOLUME LXXXVI JULY TO SEPTEMBER,
1915

THE SCIENTIFIC MONTHLY VOLUME I OCTOBER TO DECEMBER, 1915

EDITED BY J. McKEEN CATTELL




THE SCIENTIFIC MONTHLY ------ OCTOBER, 1915 -------------



THE EVOLUTION OF THE STARS AND THE FORMATION OF THE EARTH. II

BY DR. WILLIAM WALLACE CAMPBELL

DIRECTOR OF THE LICK OBSERVATORY, UNIVERSITY OF CALIFORNIA

THE PRINCIPLES OF SPECTROSCOPY

THUS far our description of the stellar universe has been