Fig. 67. 
Fig. 68. 
Fig. 69, 
Fig. 70, 
ome dl 
Fig. 72, 
Fig, 73. 
Fig. 74. 
Fig. 75. 
oO 
THE SPERMATOGENESIS OF DOMESTIC MAMMALS. 403 
Side view of metaphase of first division, showing longitudinal split of chromosome. 
Side view of metaphase of first division, showing accessory chromosome, 
Side view of anaphase of first division, showing accessory chromosome, 
Side view of late anaphase of first division. 
Telophase of first division, showing mitochondrial granules, 
Telophase of first division. 
A secondary spermatocyte in resting stage, showing mitochondrial granules, 
A resting secondary spermatocyte; idiozome and mitochondria appear. 
Polar view of metaphase of second division; a faintly stained cytoplasmic body 
appears near cell wall, 
Fig. 76. 
Fig. 77, 
Fig. 78, 
Polar view of metaphase of second division; accessory chromosome can be seen, 
Side view of metaphase of second division. 
Late anaphase of second division. 
Figs, 79—82, Telophases of second division. 
Figs, 83, 
Fig. 85, 
Figs, 86, 
Fig. 87, 
Fig, 89, 
Fig. 90, 
Fig. 91. 
Fig, 92. 
nuclear wall. 
84. Late telophases of second division. 
A Spermatid ; mitochondrial granules gather at the posterior part of cell, 
88. Spermatids; idiosome is clearly seen, 
Spermatid ; centrosomes can be seen. 
Spermatid ; idiosome begins to migrate to the anterior wall of nucleus. 
Spermatid; nucleus gradually migrates to cell wall. 
Spermatid ; mitochondria gather around centrosomes, 
Spermatid; idiosome become fixed as a small spheric body at a depression of 
Figs. 93—96, Final development of spermatozoa; dumb-bell shaped centrosomes, axial 
filament and a mass of mitochondria can be seen, | 
Figs, 97, 
98. Mature spermatozoa, 
