GENERAL PHYSIOLOGY 



175 



react as do nucleated fragments (Hofer, 1890, Willis, 1916). Jen- 

 nings' careful observations, which led him to the conclusion that the 

 protozoon organism always acts as a whole is fully confirmed by 

 these later observations and experiments.* 



^./ 



Fig. 86. — MerotoTay in Eirplotes patella. (After Taylor.) a./., anal cirri fibers; ??;., 

 motoriuni; m./., membranelle fiber. (See also Fig. 57.) 



C. Nutrition.— Under the heading nutrition are included all 

 physiological processes involved in the replacing of substances 



* For discussion of different types of stimuli and the resulting reactions by Pro- 

 tozoa see Minchin (1912), Khainsky (1910), Mast (1910-1918), Piitter (1900, 1903), 

 Jennings (1904, 1909). 



