980 



PROTOZOA AND OTHER ANIMALS 



fifty grams of cornstarch, 76 percent of the cihates had taken in grains; 

 and in from four to six hours 87 percent took in rice starch (Usuelli, 

 1930a). If the amount of starch is not excessive, most of it is eventually 

 taken into the Protozoa. The size of the grains is a factor in ingestion. 



Figure 207. Ingestion and digestion of starch in Eudiplodbiium medium. A, before 

 feeding in culture; B, 2.5 minutes after feeding, starch grains in cytoplasm; C, 12 

 minutes after feeding, cytoplasm filled with starch; D, 2.5 hours after feeding, abundant 

 deposits of glycogen; E, 16 hours after feeding, some residues of starch, glycogen deposits 

 in certain areas. (After Westphal, 1934a.) 



For example, fewer ciliates take in potato starch, the diameter of many 

 of the grains of which exceeds 100 p. 



In material kept in the thermostat, it has been found that fat droplets 

 in milk will be ingested (Ferber, 1928) ; but ingestion of accessible ma- 

 terial is not indiscriminate (Westphal, 1934a). 



