PLATE 2 
EXPLANATION OF FIGURES 
30-40 All figures from cells fixed in acetic-alcohol. 
30, 31 Older spermatogonia, stained in iron hematoxylin alone. 
32 Young spermatocyte stained in iron hematoxylin and Bordeaux red. Kary- 
ochromatin blue-black, oxychromatin or plastochondria red and yolk vesicles 
blue to light blue. 
33, 34 Maturation divisions of spermatocytes, stained in iron hematoxylin 
alone, and very heavily destained. The mitochondria of Mayer, Romieu, Faure- 
Fremiet, and others, form axial chains in the fully formed yolk vesicles. 
35, 36, 37, 38 Various stages in the formation of the refractive body in the vas 
deferens. 
39, 40 Eges being entered by spermatozoa, which show various stages in the 
consumption of the refractive body 
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