INTRODUCTION 



39 



followed by Whitman, Gurwitsch, Dobell, and many others and to 

 question again the adequacy of the cell theory m its application to 

 Protozoa. 









Cgr '*-' ■ ^ <i t) ' 





-c* 



^ 



C5^- 





f* ^ «» 



c- 



«3 





?5 (5 



«» -^^ o'*^:^ 



Vrr 18-TvDes of flagellate colonies. Uroglenopsis americana, a spheroidal 

 colony (abovlrand Codo;?,a c...osa Kent, an arboroid colony (below). (Former 

 after Calkins; latter after Kent.) 



B Protoplasmic Structure. -The specificity of protoplasm is not 

 at all indicated by its appearance although obvious differences m 

 many cases may be seen even Avith lo^v povvers of the microscope, in 

 a liyino- form what we actually see under the microscope m most cases 



