THE BEGINNINGS OF LIFE. 



199 



in diameter — was pretty sharply defined from the sur 

 rounding unaltered granular stratum. The immediately 

 contiguous granules of this stratum were occasionally 

 somewhat more tightly packed, though at other times 

 no such change was observable. In either case the 

 unaltered portion of the pellicle was quite different 

 from the included lighter area, because in this an in- 

 crease had apparently taken place in the amount of 

 jelly-like material between the granules, and, as well, 



Fig. 53. 



Development of Corpuscular Organisms : three areas of differentiation 

 showing different stages. ( X 800.} 



there was a certain alteration in the refractive index, 

 and occasionally in the size of the granules or altered 

 Bacteria. The next change observable was that the 

 included area showed lines crossing it here and there, 

 which at first tended to map it out into certain larger 

 divisions. These intersecting lines gradually increased 



