ROBERT M. YERKES 



-1 " 



yV 



\ 



/ 



-^ 



CO 



c 



s 





s 



s 



IS 



"3. 

 •g 



2 





5*53 



s. S 



3 i 

 Eg 



o 



2 J" 

 ^ bo 



^S 



'" IS 



is 



SI 



..c 



is 



I"" 

 |q 



!•« 



— • ca 



>2 



