Proceedings of tlie American Academy of Arts and Sciences. 

 Vol. XXXIX. No. 20. — April, 1904. 



CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE 

 MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE, 

 UNDER THE DIRECTION OF E. L. MARK. — No. 149. 



METABOLISM AND DIVISION IN PROTOZOA. 



By Amos W. Peters. 



