Part 9

38. GARNETT, J. B., and others. The Surgical Treatment of Sterility due to Obstruction at the Epididymis Together with a Study of the Morphology of Human Spermatozoa. Univ. of Penn. Med. Bulletin, March, 1902.

39. REYNOLDS, E. and MACOMBER, D. Defective Diet as a Cause of Sterility. Jour. of Amer. Med. Assoc., LXXVII, 169, July 16, 1921.

40. NOVARRO, P. A. Tissues of the Testicle and Antaminosis. Gazetta degli Ospedali (Milano), 1920, XLI, 424.

41. WILLIAMS, W. L. Observations on Reproduction in a Pure Bred Beef Herd. Cornell Veterinarian. January, 1922.

42. BELL, W. B. Correlation of Function: With Special Reference to the Organs of Internal Secretion and the Reproductive System. Brit. Med. Jour., 1920, 1, 787.

43. BROWN, W. L. The Principles of Internal Secretion. Brit. Med. Jour, 1920, II, 687–691.

44. JUMP. Discussion in Penn. Med. Jour., XXV, 81.

45. BIEDL, A. The Internal Secretory Organs.

46. HEWER, E. E. The Effect of Thymus Feeding on the Activity of the Reproductive Organs of the Rat. Jour. of Physiology, XLVII, 1913–1914, 479.

47. LLOYD-JONES, O. and HAYS, F. A. The Influence of Excessive Sexual Activity of Male Rabbits. 1. On the Properties of the Seminal Discharge. Jour. of Exper. Zoology, 1918, XXV, 463.

48. WILLIAMS, W. L. Improvement of the Reproductive Efficiency of Cattle. North Amer. Veterinarian, III, May, 1922.

DESCRIPTION OF PLATES

PLATE I.

Fig. 1. Diagrammatic sketches showing the development of a spermatozoon from a spermatogonium.

Fig. 2. Diagrammatic sketch showing the minute structure of a spermatozoon. The middle piece is made comparatively thick in order to bring out the finer structures. Adapted from Ellenberger.

PLATE II.

Fig. 3. Testicle of bull, showing extensive degeneration and necrosis.

PLATE III.

Fig. 4. Inner part of wall of ductus deferens. Normal. × 230.

Fig. 5. Same, but showing extensive degeneration and exfoliation of the lining membrane. × 230.

PLATE IV.

Fig. 6. Ductus deferens, showing entire exfoliation of the lining membrane. The lumen is filled with a cellular debris. × 50.

Fig. 7. Same, showing the degeneration of the lining membrane, and debris in lumen. × 230.

PLATE V.

Fig. 8. Seminal vesicle of bull. High power section showing the normal structure of the vesicular cavities.

Fig. 9. Seminal vesicle of bull. Low power. The membrane lining the cavities is degenerated and exfoliated. The cavities are filled with cellular debris, and exudates. There is some increase in the interstitial tissue, and atrophy of some of vesicular cavities.

PLATE 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.