PLATE 5 
EXPLANATION OF FIGURES 
49 to 51 Anaphases of the first maturation mitosis showing the dissociation 
of the X-complex and the unequal distribution of its components. 
52 and 53. Lateral and polar view of the pole of the spindle receiving the X- 
chromosome. The large chromosomes, which lag behind the euchromosomes, 
have been represented in the same plane in figure 53. 
54 Several stages of the dissociation of the complex showing the progressive 
appearance of the small chromosomes. 
55 Dissociation of the complex. One of the spindle fibers is attached to one 
or both small chromosomes. 
56 Normal metaphase of a secondary spermatocyte with X-chromosome. 
57 Metaphase of a secondary spermatocyte with eighteen chromosomes. 
58 and 59 Metaphases of secondary spermatocytes without X-chromosome, 
with sixteen and seventeen chromosomes, respectively. 
60 to 63 Lateral views of the anaphases of the secondary spermatocytes, show- 
ing the division of the large chromosomes of the X-complex. 
64 Cyst with primary spermatocytes during the resting stage which follows 
the last spermatogonial mitosis and spermatocytes in the prochromosome stage. 
65 Spermatocyte during the resting stage. 
66 Formation of the prochromosomes. 
67 to 69 Spermatocytes during the prochromosome stage. The X-chromo- 
some is still condensed in figure 67, while in figures 68 and 69 it appears as a 
coarse thread. 
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