FOURTH REPOirr 



OK TtlK 



MICHIGAN 



OF SCIENCE 



Exchanges should be sent to Dr. G. P. Burns, 

 Librarian, Ann Arbor, Mich. 



librarV 



NBW YORK 



B<^)TAMCAL 



GAROaN 



PREPARED UNDER THE DIRECTION OF THE COUNCIL 



BY 



JAMES B. POLLOCK, Sc. D., 



SECRETARY 



BY AUTHORITY 



LANSING, MICH. 

 ROBERT SMITH PRINTING CO., STATE PRINTERS AND BINDERS 



1904 



