^f. '^'^^ \v 



> 





Mary J. Guthrie 



RESEARCH ASSOCIATE, EMERITUS, DETROIT INSTITUTE OF CANCER RESEARCH 

 PROFESSOR OF BIOLOGY, WAYNE STATE UNIVERSITY 



ZOOLOGY 



John M. Anderson 



PROFESSOR OF ZOOLO(iV, C:ORNEI.L UNIVERSrr\- 



NEW YORK • JOHN WILEY & SONS, INC. 

 London 



