PREFACE 



The contents of this book have as their basis a series of lec- 

 tures bearing the same title which were given at Yale Univer- 

 sity, during the academic year 1921-1922, under the auspices of 

 the Society of the Sigma Xi. As President of the Yale Chapter 

 for that year it became my duty to arrange the program for 

 the Society, and after considerable thought I came to the con- 

 clusion that the previous successful series of Sigma Xi lectures, 

 which were given in 1916-1917, and later published by the 

 Yale University Press, on "The Evolution of the Earth and 

 Its Inhabitants," could be continued with interest and profit by 

 another series in which specific consideration was given to the 

 question of the evolution of man. Accordingly a series of 

 lectures was arranged as follows : 



THE EVOLUTION OF MAN 



Lecture I. The Antiquity of Man, December 2, 1921, Pro- 

 fessor Richard Swann Lull. 



Lecture II. The Natural History of Man, January 20, 1922, 

 Professor Harry Burr Ferris. 



Lecture III. The Evolution of the Nervous System of Man, 

 February 10, 1922, Professor George Howard Parker. 



Lecture IV. The Evolution of Intelligence, April n, 1922, 

 President James Rowland Angell. 



Lecture V. Societal Evolution, March 10, 1922, Professor 

 Albert Galloway Keller. 



Lecture VI. The Trend of Evolution, March 22, 1922, 

 Professor Edwin Grant Conklin. 



The first lecture, by Professor Lull, sets forth the paleonto- 

 logical evidence for the evolution of man. In the second, 

 Professor Ferris gives in detail, largely from the anatomi- 

 cal and embryological standpoints, some of the important 



