N. H. SWELLENGREBEL 
465 
which wanders towards the nucleus, the latter being previously reduced. 
Fig. 1 might represent the expulsion of the chromatin from the ble- 
pharoplast, figs. 2 and 3 the wandering towards the nucleus and fig. 4 
the arrival of the chromatin near the nucleus. I believe, however, that 
fig. 5 seems to indicate that sometimes the chromatin may not reach its 
destination and may be dispersed on the way. The observations of the 
authors I have mentioned indicate oulj^ that the chromidia may be 
produced near the nucleus and the blepharoplast; but that this 
phenomenon has anything to do with an autogamy is not proved. 
Hindle (1909) seems to hold the same opinion regarding T. dimorphon. 
Prowazek’s “ nuclear reduction ” occurring in the blood of the rat 
must be regarded as a stage in the formation of chromidia. 
As to the origin of these chromatic granules, I have no actual proof 
that they are really formed by the nucleus or the blepharoplast, although 
this seems to be probable judging from the phenomena observed in 
degenerating cells (see section III: abnormal morphology). Their 
chemical constitution could not be studied because they w'ere not 
frequent enough to be found in normal cells. 
•Fig. 1. Isolated periplast showing longitudinal striae. 
Fig. 2. Trypanosome with long hindend and two striae. 
