Vlll PREFACE. 



raphy, the process having been so far improved by me as to be made very 

 available for these uses. For several of the specimens from which pho- 

 tographs have been taken I am indebted to Mr. Abbott. 



In this work I have therefore endeavored to treat of man according to 

 the methods accepted in Physical Science, but still of man as an individ- 

 ual only. Physiology, however, in its most general acceptation, has an- 

 other department connected with problems of the highest interest. Man 

 must be studied not merely in the individual, but also in the race. 

 There is an analogy between his advance from infancy through child- 

 hood, youth, manhood, to old age, and his progress through the stages of 

 civilization. In the whole range of human study there are no topics of 

 greater importance, or more profound, than those dealt with in this sec- 

 ond department or division. It is also capable of being treated in the 

 same spirit and upon the same principles as the first. I 'have nearly 

 completed a volume, which will serve as a companion to this, in which 

 in that manner the subject is discussed, and the laws which preside over 

 the career of nations established, and would bespeak for it the considera- 

 tion of the reader. 



JOHN W. DRAPER. 



University, Neio York, July 1st, 1858. 



