256 CM. WENYON. 



unable to trace, though some of the appearances seem to 

 indicate the formation of two new ones by outgrowth from the 

 rhizoplast. In fig. 18 is the nuclear apparatus of a flagellate 

 partially broken up on the film. It shows very clearly the 

 single rhizoplast with the duplicated flagella. The last stage 

 in the division process is thus the splitting of the rhizoplast, 

 while the first stage is the multiplication of the flagella and 

 the commencing division of the karyosome. After complete 

 division the nuclei pass to opposite poles of the body (fig. 17), 



Text-fio. 18. 



18. 



Part of nucleus, rhizoplast. and flagella of partly broken-down 

 individual, to show the multiplication of the flagella before 

 division of the nucleus and rhizoplast. 



and after a varying interval of time the body is divided into 

 tAvo equal parts. 



The bright refractile granules which were described above 

 as occurring in the pi'otoplasm around the nucleus in the 

 encysted forms and in some of the free forms appear in the 

 stained specimens as dark-staining granules. Whether these 

 are chromatin granules of the nature of a chromidium or 

 whether they are capable of some other interpretation cannot 

 be definitely stated, since their fate has not been followed. 

 They certainly stain as chromatin, and their presence within 

 the cyst (fig. 19) would seem to suggest the possibility of 



