THE 



BIOLOGY OF THE PROTOZOA 



BY 



GARY N. CALKINS, Ph.D., Sc.D. 



PROFESSOR OF PROTOZOOLOGY, COLUMBIA UNIVERSITY 



SECOND EDITION, THOROVOHLY REVISED 



ILLUSTRATED WITH 223 ENGRAVINGS AND 2 COLORED PLATES 



LEA & FEBIGER 



PHILADELPHIA 

 19 3 3 



