ILLUSTRATIONS 



FIG. PAGE 



1. Cell division. Prophases. After Wilson .... 9 



2. Cell division. Later phases. After Wilson ... 11 



3. The ovarian egg ......... 13 



4. Human spermatozoa ........ 14 



5. Genital organs of boar. After Ellenberger .... 21 



6. Sections through ovary of rat 25 



7. Genital organs of mare. After Ellenberger . . . . 26 



8. Genital organs of cow. After Ellenberger .... 29 



9. Genital organs "of sow. After Ellenberger .... 30 



10. Genital organs of bitch. After Ellenberger . . 32 



11. Normal presentation in mare ... ... 76 



12. Posterior presentation . . . . . . . .77 



13. Abnormal anterior presentation 78 



14. Abnormal posterior presentation 78 



15. Abnormal transverse presentation 79 



16. Diagram illustrating mendelian inheritance .... 140 



17. Diagram illustrating mendelian inheritance .... 145 



PLATES 



PLATE FACING PAGE 



I. Genital organs of mare. After Ellenberger ... 43 

 II. Superfoetation in mare 62 



III. Upper : A mare mule that secretes milk . . . .84 

 Lower: A Free-Martin heifer 84 



IV. Unusual fertility in a cow. Triplet calves . . . 108 

 V. Normal, heal thy uterus of sow . . . . .- . 118 



VI. Uterus of sterile sow . c ,,;/ H9 



xv 



