PLATE 3 
EXPLANATION OF FIGURES 
31 aandb. Germ cells in cord outside of testis before period of migration. 
32 a,b,candd. Shapes assumed by germ cells during migration to periph- 
ery of testis. 
33. aandb. Germ cells located at the periphery of testis just after period 
of migration. 
34 Germ cells during the period of growth and proliferation. a, maximum 
size; b, intermediate size; c, minimum size. 
35 Polar view of dividing germ cell showing 27 chromosomes. 
36 Equatorial view of early anaphase of dividing germ cell. 
37 Three stages in the transformation of the germ cells into spermatogonia 
a, early stage; b, late stage; c, intermediate stage. 
38 aandb. Resting spermatogonia. 
39 Dividing spermatogonia. a., polar view of metaphase; b, equatorial view 
of metaphase. 
40 aandb. Two nuclei in the bouquet stage of synezesis. 
41 Dividing spermatocytes. a, polar view of a metaphase; b, equatorial 
view of an anaphase; c, equatorial view of a metaphase. 
42 Transforming spermatids. 
43 Single spermatozoon greatly enlarged. 
44 Group of spermatozoa. 
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