viii THE BIOLOGICAL BASIS OF INDIVIDUALITY 



sciences which contribute the data needed for this purpose. The method thus 

 chosen suffers from the difficulty that a single author may not be able to treat 

 with equal competence all the problems involved; but it is believed that the 

 unified presentation of these fields may, to a certain extent, compensate for 

 such a deficiency. 



In the following chapters these types of individuality are analyzed as to 

 their evolution and their biological and psychical manifestations. 



It is hoped that this presentation may be of interest to the biologist and to 

 the general pathologist and that certain parts of it may be helpful even to the 

 surgeon in the practice of tissue grafting, to the geneticist, to the student of 

 cancer and to the immunologist ; perhaps also to the psychologist and to some 

 philosophers. 



