THE CELL 



gium at least is a distinct structure, and chromidia more probably also, 

 though by some regarded as the elements from which the filamentous 

 mitochondria are formed. Mitochondria have been credited with most 



I 



f -r > 



"**"" ^mm~~- 



a b c d 



FIG. 9. CELLS FROM THE NEWLY HATCHED RAINBOW TROUT, TREATED ACCORDING 

 TO MEVES' TECHNIC FOR THE DEMONSTRATION OF MITOCHONDRIA (PLASTOSOMES). 

 a and b, cartilage cells; c, young blood cell; d, epithelial cells from the intestine. 

 X 2000. 



various functions, e.g., formation of presecretion and excretion granules, 

 and the formation of various kinds of fibrils. M. Heidenhain regards the 

 chondriosomes as vegetative organs of the cells subserving metabolism. 



FIG. 10. Two CELLS FROM THE MESENCHYMA OF THE NEWLY HATCHED RAINBOW 



TROUT. 



The one to the left (a) at late anaphase of mitosis, showing mitochondria (plasto- 

 somes). M eves' technic. X 2000. 



Our knowledge is as yet too limited to speak with assurance either as to 

 their origin, complete function, or fate. One thing only is certain, 

 namely, that they are actual constituents of the cytoplasm of practically 



