Fo7'eword 



H. Gilbert and Barton W. Evermann he is especially 

 indebted for jogging his recollection as to details in 

 which they were concerned. As Agassiz often said, 

 *' Memory must not be kept too full or it will spill 

 over." He is further under obligation to Professors 

 M. Anesaki of the Imperial University of Tokyo and 

 K. Hara of the Imperial University of Kyoto, who 

 gave a critical reading to Chapters xxvi and 

 XXVII. Finally, for any errors in fact or interpre- 

 tation which may have slipped through anywhere, 

 he craves indulgence. 



DAVID STARR JORDAN 



March, 1921 



C viii H 



