PLATE 2 
EXPLANATION OF FIGURES 
lland12 Synapsis stage, showing the parallel arrangement of paired threads. 
13 Pachytene stage, showing longitudinal splittings in each thread. 
14 Pachytene stage, showing the bouquet-like arrangement of threads. 
15 and 16 Diakinesis stage. 
17 Tetrads. 
18 Tetrads transformed into rods, dumb-bells, ete. 
19 and 20 Equatorial plates of the first maturation mitosis showing twenty- 
four bivalent chromosomes. 
21 Side view of the first maturation metaphase. 
22 to 25. Successive transformation stages of the spermatid up to just before 
the formation of the reticular nucleus. 
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