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.

PLATE I

PLATE II

PLATE III

PLATE IV

PLATE V

PLATE VI

PLATE VII

PLATE VIII

PLATE IX

PLATE X

PLATE XI

PLATE XII

TRANSCRIBER’S NOTES

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[54][blank]Bacteriology of the Genital Tracts of Mature Infertile or Sterile Bulls Group VI