iy iS 
Vou. LXXVII. No. 2. AUGUST, 1910 
THE 
POPULAR SCIENCE 
MONTHLY 
EDITED BY J. McKEEN CATTELL 
CONTENTS 
The Past and Present Status of the Ether. Professor ARTHUR GoRDON 
WEBSTER . : ‘ : : 5 ; . 105 
~ Physiologic Light. F. hee NEoEcadeon ; . 114 
Instinct and Intelligence in Birds. Professor Eeancts i. Hate . 122 
The Paleontologic Record: 146 
Anatomy and Physiology in Fnyertebbate Extinct Organisms, RUDOLF RUEDEMANN; 
Contributions to Morphology from Paleontology, Professor WILLIAM BULLOCK 
CLARK ; Relation of Embryology and Vertebrate Paleontology, Professor RICHARD 
Swan LULL. | 
Observations on the Earthquake of May 26,1909. Professor J. A. UppEn 154 
The Methods and Uses of a Research Museum. JosmrH GRINNELL . 163 
The Effects of Smoking on College Students. Dr. Groren L. Mnynan . 169 
The Danger of Unskill. WatrerG. Beach . : ; Ee ke) 
Bacteriology and Parasitology in Relation to’ Avian “Diesen: Dr 
GroRGE Epwarp GAGE . : ; . 186 
The Role of Selection in Plant Breeding. Professor Eowaen M. fawn . 189 
The Progress of Science : 204. 
The Work of the New York Zoological Society ; Deaths among American Men of 
Science ; Scientific Items. 
THE SCIENCE PRESS 
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, COPYRIGHT, 1909, By THE SCIENCE PRESS 
