544 Theophilus s. Painter, 



small densely-staining particles which undoubtedly represent the 

 planosomes and ctetosomes. 



The autosomes of the second division are reconstructed from 

 the reticulum of the restin;^ stage, as was the case with Maevia; 

 and after the nuclear wall is dissolved they are drawn into the 

 spindle. In the early metaphase, there are two points of interest 

 for us. The first is shown in Fig. 79, where we find the accessory 

 chromosome dividing. The second is shown in Fig. 80 where we 

 find two very small chromosomes dividing early. This behavior of 

 the small bodies does not take place in all of the cells, only about 

 half of them showing it. In all of the cells which show the 

 accessory chromosomes, these small bodies have been seen dividing 

 precociously, and since only half of the second spermatocyte cells 

 show this behavior, it has been assumed that they were probably 

 the ctetosomes. Obviously, there is no way of demonstrating this. 



Telophase. The division of the autosomes is not attended 

 by any striking irregularity. It seems to be the simple separation 

 of V-shaped elements. 



Planosomes. 



Seen in equatorial view (Fig. 82 or 83), the autosomes are packed 

 together in the middle of the spindle, and lying on the edge we 

 find a varying number of very small chromosomes. As the autosomes 

 go apart, to the two poles of the cell, we find lagging behind in 

 the spindle numerous small bodies (Fig. 81). The number of these 

 supernumeraries varies, but it is very interesting to note that at 

 this time one may see with ease the spindle fibers which attach 

 these planosomes to the . centrosomes. In the figure we may see 

 where one fiber has apparently broken loose from the centrosome. 



In order to determine the number of supernumeraries present 

 the the second spermatocyte cells, fifty-eight counts of telophase 

 stages have been made, the results of which are given in the 

 following table. 



Table I. 



No. of supernumeraries J 2 3 4_ bG 7__ 8 9 10 1 1 12 13 14 15 



No. of cells showing 1 11 G 8 5 13 4 Ö 1 1 1 1 



The counts made at this time have been subject to the same 

 errors which were pointed out for the first division and their value 

 for this reason is not as great as it would be otherwise. When we 



