126 



ZOOLOGY 



uphold the suggestion, it does seem a Ukely one, since in the rest 

 of the cytoplasm of Opalina and Paramoecium, and in fact in many 

 other cells in which lineated structures are not present, the mito- 

 chondria lie haphazard in the cell. 



The last case of adherence of mitochondria to surfaces men- 



F.i/ac. 



Fig. 59. — Portions of Amoeba showing the process of digestion in 

 relation to the mitochondria (from Horning (61) ). C, cell 

 outline ; F.vac, food-vacuole ; F.pt., food-particle ; M., mito- 

 chondria. 



tioned by Horning is also the most interesting from the point of 

 view of the function. 



Observed in both living and stained preparation, the mito- 

 chondria in Amoeba have been seen to adhere to engulfed food 

 particles (65). So far as he has been able to see, the mitochondria 

 become attached to the food as it commences to circulate through 

 the cell (Fig. 59, A). No mention is made of an enclosed vacuole 

 of water engulfed with the food ; in fact evidence definitely con- 

 troverting that idea is found later in the process. The mito- 

 chondria on the food particle apparently secrete, cause to be 



