MITOCHONDRIA VARIATIONS IN NERVE CELLS 343 



only between the Nissl bodies (as is generally believed) but also 

 embedded in them. 



They also vary in different kinds of nerve cells microchemi- 

 cally. The most striking instance is the greater resistance of 

 the mitochondria in some cells to fluids containing acetic acid 

 as compared with other cells of different types. The mitochon- 

 dria in the different parts of the cytoplasm of the same cell 

 react in the same manner to solvents. 



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