PLATE 2 
EXPLANATION OF FIGURES 
Spermatogonia—Continued 
8,9, and 10 Metaphase plates of the early spermatogonia. Figures 8 and 9 
show the approximate pairing of the chromosomes. 
11 Side view of the same stage. 
12 and 13 Metaphase plates of the late spermatogonial mitoses. 
14 and 15 Late anaphases showing the chromosomes approaching the poles 
15 b Cross-section of an early telophase. 
14, 15, and 16 Formation and development of midbodies. 
16a Late spermatogonial telophase showing the formation of the cell wall 
by the midbodies. 
16 b Cross-sections of the nuclear region of the same stage showing the 
woolly appearance of the chromatic bodies. 
Spermatogonial growth period 
17 The diffuse postspermatogonial stage. 
18 Early leptotene nucleus. 
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