PLATE 10 



EXPLANATION OF FIGURES 

 X 1350 



Mitochondria. Chromatin represented by dark grey, mitocliondria by bhick and 



grey. N. insidata 



111 Late growtli, mitoehondrial mass attaclied to nuclear wall. 



112 Later stage. 



Ill) Transition stages between spheres and fibers. Free hand di'awing. 



114 Metaphase, first division. 



115 Division of mitochondria en masse with cell division. 



N. undulata 



116 Early growth, formation of mitochondria near nuclear bulge. 



117 Mitochondria becoming evenly distributed. 



12(1 



