61 



Fig. 7. Same, showing the degeneration of the lining membrane, and 

 debris in lumen, x 230. 

 Plate V. 



Fig. S. Seminal vesicle of bull. High power section showing the 

 normal structure of the vesicular cavities. 



Fig. 9. Seminal vesicle of bull. Low power. The meml>rane lining the 

 cavities is degenerated and exfoliate<i. The cavities are 

 filled with cellular debris, and exudates. There is some 

 increase in the interstitial tissue, and atrophy of some of 

 vesicular cavities. 

 PXATE VI, 



Fig. 10. Low power section of seminal vesicle of bull. The condition is 

 about the same as in Fig. 9 except that it is not quite as 

 severe. 



Fig. 11. Same as Fig. 10. High power. 



Plate VII. 



Fig. 12. Testicular tubule showing normal spermatogenesis, x 230. 

 Fig. Il3. Testicular tubule showing no evidence of mitosis, x 230. 

 Fig. 14. Testicular tubule. The spermat-ogenic epithelium is beginning 



to degenerate and become cast off into the lumen, x 230. 

 Fig. 15. Testicular tubule, showing almost total exfoliation of the 



spermatogenic epithelium, x 230. 

 Plate VIII. 



Fig. 16. Testicular tubule. The seminal epithelium is entirely degen- 

 erated. The membrana propria is markedly thickened. 

 X 230. 



Fig. 17. Testicular tubule. The tubule is undergoing atrophy and 

 degeneration. The interstitial connective tissue is much 

 increased in amount, x 230. 



Fig. 18. Same as Fig. 17, except that it is in the more advanced stages. 



Fig. 19. Testicular tubule. The spermatogenic epithelium has under- 

 gone a sort of hydropic degeneration. The interstitial con- 

 nective tissue has become much increased in amount and 

 has undergone cellular infiltration. 

 Plate IX. 



Fig. 20. Xormal structure of epididymis tubule, x 140. 



Fig. 21. Epididymis tubule showing exfoliation of the lining membrane, 

 and cellular debris in the lumen, x 140. 



Fig. 22. Atrophy and degeneration of epididymis tubule. The inter- 

 stitial connective tissue is much increased in amount, x 140. 



Fig. 23. Same, but in more advanced stage, x 140. 



Plate X. 



Fig. 24. About the same as Fig. 22. x 140. 



Fig. 25. ilarked degeneration of epididymis tubule. There is a cellular 

 infiltration of the interstitial tissue, x 60. 

 Pr.ATE XL 



Fig. 26. Spermatozoon, showing constriction at middle of head. The 

 head is also somewhat contorted, x 670. 



Fig. 27. Spermatozoon. Pear shaped head, x 670. 



Fig. 28. Spermatozoon. The head is quite long, and pointed at its 

 posterior end. x 670. 



Fig. 29. Spermatozoon, showing a constriction at middle of the head. 

 X 670. 

 Plate XII. 



Fig. 30. ^licrocephalic spermatozoon, x 670. 



Fig. 31. Spermatozoon. The head is small, and pear shaped, x 670. 



Fig. 32. Macrocephalic sperm. The middle piece is nuuli thickened. 

 X 670. 



Fig. 33. Tailless spermatozoa, x 670. 



