PLATE 2 
EXPLANATION OF FIGURES 
Figures 14-22, Asilus sericeus, middle and late growth stages. 
14 Late stage b, four of the bivalents drawing out into diplotene threads, 
the other attached to the plasmosome, forming the nucleolar complex. Three 
of the threads are, respectively, at the top, the extreme left, and the extreme 
right of the figure; the fourth is at a low focus, indicated by its light color, and 
passes underneath the nucleolus. The nucleus is entire. 
15 and 16 Stages progressively later than the preceding, showing the conden- 
sation of the threads and their orientation with respect to the nucleolus; nuclei 
entire. 
17 Contraction stage, nucleus entire. 
18 to 20 Successive stages following the contraction. The diplotene threads 
extend out like fingers from the nucleolus; nuclei entire. 
21 Prophase of the first spermatocyte division; nucleus entire. The four 
long threads have broken loose from the nucleolus; the latter has become smaller 
and is mostly chromatic. 
22 First spermatocyte metaphase showing the five bivalents. 
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