DEC 8 1 
THE UNIVERSITY OF CHICAGO. 
FOUNDED BY JOHN D. ROCKEFELLER. 
Spermatogenesis 
of Hybrid 
. A DISSERTATION 
Submitted to the Faculties of the Graduate Schools of Arts, 
Literature, and Science, in Candidacy for the 
Degree of Doctor of Philosophy, 
' DEPARTMENT OF ZOOLOGY. 
BY 
MICHAEL RGUYER, 
Ci. 
■ 'v 
CHICAGO: J900. 
