82 JOSE F. NONIDEZ 
(c, d). The split condition of the bridge seems to be connected 
with the last position. 
It is obvious that in the normal anaphases both small chromo- 
somes go into the same cell as the X-chromosome, as proved by 
the number of chromosomes present in polar (fig. 53) and lateral 
views (figs. 49 and 50) of the late anaphase. In the latter they 
are well separated from the large chromosomes but always lo- 
cated in their immediate vicinity, the whole group lagging be- 
hind the euchromosomes (figs. 51 and 52). On the other hand, 
conditions similar to that represented in figure 54, f, point to 
irregularities in their distribution; the small chromosomes of this 
complex appear to pass to the cell which does not receive the 
accessory. It is questionable whether both enter the same cell 
or whether they separate a little later, but in any case the close 
connection of one of them with the M-chromosome leads to this 
conclusion. This unusual distribution might be explained as a 
result of the passive réle of the small chromosomes and their con- 
nections with the other components of the complex. 
One of the causes of the abnormal distribution of the chromo- 
somes of the complex is found in the fact that the spindle fibers 
may have an attachment different from that described in the 
metaphase. In a few instances neither M-chromosome is at- 
tached to a spindle fiber of its own; in this case the attachment is 
normal for the X-chromosome, but one of the small components 
has taken the place of the former. The result in this case may be 
inferred upon inspection of figure 55, b, c. The small chromo- 
some, which here takes the place of one of the large ones, prob- 
ably does not separate from the others, but enters the same cell 
with them, although it is considerably stretched. The normal 
distribution of the chromosomes is, however, not brought about, 
for both M-chromosomes now behave as passive bodies and are 
drawn into the same cell. This may account for the existence 
of secondary spermatocytes containing all the components of the 
complex together with the haploid number of euchromosomes, a 
condition which at first appeared very difficult to explain, for 
had the separation of the daughter cells failed to take place, 
the diploid number of euchromosomes would have been retained. 
