SCIENCE 



Peidat, April 21, 1916 



CONTENTS 



The Present State of the Problem of Evolu- 

 tion: Pkofessok M. Caulleey 547 



Sir Clements S. Marlcham ; A. C. B 559 



Principal Causes of Death in the United 

 States 562 



Scientific Notes and News 564 



University and Educational News 566 



Discussion and Correspondence: — 



The Current "Definition" of Energy: Pko- 

 FESSOE M. M. Gaever. a Peculiar Breed of 



s: Peofessoe J. J. Hoopee 567 



Scientific Boohs: — - 

 Bryan on the Natural History of Hawaii: 

 Dk. L. O. Howaed. McKenzie on Exercise 

 in Education and Medicine: Peofessoe 

 -George L. Meylan. Steinmetz's Electrical 

 Engineering, Baillie's Electrical Engineer- 

 ing, Murdoch and Oschwald's Electrical 

 Instruments : J. H. M 571 



Special Articles: — 

 A New Method for the Graphical Solution 

 of Algebraic Equations: Horace G. Deming. 

 The Coordination of Chromatophores by 

 Hormones: Alfred C. Eedfield 576 



Societies and Academies: — 



The American Philosophical Society. The 

 Biological Society of Washington: Dr. M. 

 W. Lyon, Je. The Botanical Society of 

 Washington: Dr. W. E. Saffoed 581 



MSS. intended fer publication and books, etc., intended f»r 

 review ak.uld be sent to ProfesBor J. MoKeen Cattell, Garrison- 

 On-HudaOD. N. Y. 



THE PRESENT STATE OF THE PROB- 

 LEM OF EVOLUTION 1 



The exchange of professors between the 

 Sorbonne and Harvard University for the 

 first time brings to Cambridge a professor 

 of science. In a certain way I come in re- 

 turn for the visits which Professor M. 

 Bocher and Professor W. M. Davis have 

 already made to the faculty of sciences at 

 Paris. All my predecessors belonged to our 

 faculty of letters. All have brought back 

 a recollection of the hearty welcome which 

 they received, and what they told me con- 

 tributed largely in inducing me to accept 

 the mission which was offered to me. I had 

 the assurance of good-will and generous 

 sympathy from my colleagues as well as 

 from my pupils. 



In the beginning I must excuse myself for 

 not being able to express myself, at least 

 for the present, in English. The most im- 

 portant point in teaching is clearness in ex- 

 pressing thoughts. By speaking to you in 

 my own language I hope to succeed much 

 better in a difficult subject and for that rea- 

 son to obtain forgiveness for the effort 

 which, to my great regret, I occasion you. 



The purpose of the exchange between the 

 two universities is to convey to the one the 

 methods of teaching employed in the other. 

 I have the honor to occupy at the Univer- 

 sity of Paris a chair of biology especially 

 devoted to the study of the evolution of 

 organic beings. It is then to the present 

 state of this great problem that the lectures 



1 Aa introductory lecture in a course offered by 

 M. M. GauUery as exchange professor at Harvard 

 University, February 24, 1916. Translated from 

 the French by Mrs. 0. H. Grandgent. 



