Vol. LXXV. No. 3. SEPTEMBER, 1909 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEK CATTELL 



CONTENTS 



Capacity of the United States for Population. Professor Albert Perry 



Brigham , 209 



Peale's Museum. Dr. Harold Sellers Colton . 221 



The Theory of Individual Development. Professor Frank R. Lillie . 239 



The Origin of the Nervous System and its Appropriation of Effectors. 



Professor G. H. Parker 253 



Another Mode of Species Forming. Luther Burbank 264 



Henri Poincare and the French Academy. M. Frederic Masson . . .267 



Collecting and Camping Afoot. A. S. Hitchcock 274 



The Necessity for an International Language. Dr. Ivy Kellerman . . 281 

 What is a Living Animal ? How much of it is alive ? Dr. A. F. A. King 289 

 Abandoned Canals of the State of New York. Ely Van de Warker . . 297 

 The Progress of Science : 



Tennyson and the Science of the Nineteenth Century ; The Remin- 

 iscences of Sir Francis Galton ; The Eugenics Laboratory of the Uni- 

 versity of London ; The Inheritance of Vision ; Scientific Items . . 306 



THE SCIENCE PRESS 



LANCASTER. PA. GARRISON, N. Y. 



NEW YOEK : Sub-Station 84 



Single Number, 30 Cents Yearly Subscription, $3.00 



Copyright, 1908, by THE SCIENCE PRESS 



