78 JOSE F. NONIDEZ 
same nucleus, as shown in figure 38, in which all the chromosomes 
of a cell were drawn in their actual position, while in figure 39 
they were arranged in a series. Euchromosomes 1 to 3 show a 
more or less conspicuous splitting, while in the one marked 4 
the two halves diverge to produce a V. Euchromosomes 5 and 
6 appear as Y-shaped bodies, seen endwise in 7, 8, and 9. The 
other chromosomes are well on the way to condensation, which 
seems to be combined with a displacement of the halves of each 
bivalent in such a way that both components, which at first 
were placed side by side, come to lie end to end. 
The X-complex appears at the end of the prophase as an ap- 
proximately V-shaped body (figs. 36, b, and 37). Its apex is 
occupied by a round or oval chromosome which owing to its 
dense condition retains the stain longer than any of the other 
NAAAAN 
a b @ d 
Diagram 2 
chromosomes, even in much decolorized slides. This body, as 
shown by its history throughout the growth period, is the ac- 
cessory or X-chromosome. 
The arms of the V-shaped complex are formed by the M- 
chromosomes which are less dense. In some complexes the X- 
chromosome is located in the free end of one of the latter instead 
of being at the apex of the V, a condition found also in the 
metaphase. 
The small chromosomes of the complex are united with the 
X-chromosome, but their position is highly variable as shown in 
figure 41 and diagram 2. In a few cases one may be united with 
one of the M-chromosomes, as seen in the same figure d, which 
shows one condensed and lying over the X-chromosome, while 
the other is still a thin thread connected with one of the M- 
chromosomes. In most cells, however, the first condition pre- 
