The Popular Science Monthly 
Entered in the Post Office in Lancaster, Pa., as second-class matter. 





















CONTENTS OF THE JULY NUMBER 
A Naturalist in the Straits of Magellan. Dr, CHARLES 
HASKINS TOWNSEND, 
The Future of the Human Race. Professor T. D, A, 
COCKERELL, 
Middle and Distance Running. Cuas E, HAMMETT. 
The Symbolism of Dreams, HAvELOcK ELLIs, 
Modern Medievolism. Dr, FraAnK T, CARLTON, 
The Nature of Disease and of its Cure. Dg. JAMES 
FREDERICK ROGERS. 
The Paleontologie Record: 
Paleontologic Evidences of Climate, J. W. STANTON, 
The Migration and Shifting of Devonian Faunas, 
Professor Henry §S, Witiiams. Paleontologic 
Eyidences of Adaptive Radiation, Professor HENRY 
FAIRFIED OSBORN, 
Instinct and Intelligence in Birds. Professor FRANCIS 
H. HERRICK, 
The Progress of Science : 
The Johns Hopkins University ; Medical Education 
in the United States; Robert Koch; Scientifi® 
Items. 







CONTENTS OF THE AUGUST NUMBER 
The Past and Present Status of the Ether. Professor 
ARTHUR GORDON WEBSTER. 
Physiologic Light. F. ALnEx. McDERMOTT. 
Instinct and Intelligence in Birds. Professor FRANCIS 
H. HmRRIck. : ; 
The Paleontologic Record: Anatomy and Physiology in 
/ Invertebrate Extinct Organisms, RupOLF RUEDE- 
MANN. Contributions to Morphology from Paleon- 
tology, Professor WILLIAM BULLOCK CLARK, Re- 
lation of Embryology and Vertebrate Paleontology, 
Professor RICHARD SWAN LULL. 
Observations on the Earthquake of May 26, 1909. Pro- 
fessor J. A. UDDEN. 
The Methods and Uses of a Research Museum, JOSEPH 
GRINNELL. 
The Effects of Smoking on College Students. Dr. GEORGE 
L. MEYLAN. 
The Danger of Unskill. WALTER G. BEACH, a 
Bacteriology and Parasitology in Relation to Avian 
Diseases. Dr. GEORGE EDWARD GAGE. 
The Role of Selection in Plant Breeding. Professor 
EDWARD M. EAst. 
The Progress of Science: The Work of the New York 
Zoological Society ; Death among American Men of 
Science ; Scientific Items, 




































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