184 H. M. WOODCOCK. 



(or dorsal) half, the kinetic^ portion, is perceptibly smaller, 



Fig. 8. — Development of an indifferent Trypanosome from an 

 ookinete of indifferent character, t.chr. = trophonuclear clivomo- 

 some ; /c. cTir. = kinetonuclear do.; c := centrosomic granule; a.s. 

 = first axial spindle; a.s^, «.s^ = second and third do.; / = 

 trophonucleus ; /: =: kuietonucleus ; /I'.c. = kinetonuclear centro- 

 some ; t.c. = trophonuclear do. ; vi =^ mj'onemes ; f.b. = flagellar 

 border oF undulating membrane (third axial spindle) ; c^ = its 

 proximal centrosonie. (After Schaudinn.) 



1 It is here inferred (though not explicitly stated by the author) that the 

 splitting merely separates again the trophic and kinetic constituents which 

 had united, male and female kinetic elements, on the one hand, and trophic 

 ones, on the other, remaining together. There is no evidence that, in the 

 indifferent ookinete, each of the two nuclei thus formed contains both 

 trophic and kinetic parts (i. e., that each is entirely unisexual, one having 

 male, the other female chromosomes only). This is the more unlikely, 

 since, in that case, the nuclei of the indifferent Trypanosomes would not be 

 comparable with those of the others (of. below, pp. 188 and 191). 



