Text Appearing Before Image: theirducts, the vasa deferentia, the latter conveying the semen to theurethra, or to the vesiculge seminales, which are oval bags con-nected with the upper surfaces of the neck of the bladder. Herethe seminal fluid is stored up for use, and when wanted isconveyed into the vagina by means of the external organ orpenis. The anatomy of the testicles is that which mainly con-cerns the horse-master, as they are generally removed by operation.They are contained within the scrotum, which is externally com-posed of skin, wrinkled in the foal, but subsequently distendedby the size and weight of its contents. Beneath this is a layerof a pale-yellowish fibrous membrane called the dartos, whichenvelops the testes and forms a separation between them. Athin coat of cellular membrane alone separates this from ther double serous membrane, the tunica vaginalis, which almostentirely envelops each testis, just as the pleura does the lung.In the early stages of foetal life the testes are contained within Text Appearing After Image: (88J DIGESTIVE APPAEATUS OF THE HORSE. 1. Mouth. 2. Pharynx. 3. (Esophagus. 4. Diaphragm. 5. Spleen. 6. Stomach (left sec.) 7. Duodenum. 8. Liver—upper extremity. 9. Large colon. 10. Caecum. 11. Small intestine. 12. Floating colon. 13. Eectum. 14. Anus. 15. Left kidney and its ureter. 16. Bladder. 17. Urethra. 1893 CIRCULATORY ORGAJiTS OF THE HORSE. 1. Heart—right ventricle. • 2. Heart—^left veutricle. 3. Heart—left auricle. 4. Pulmonary artery. 5. Pulmonary veins. 6. Anterior aorta. 7. Common carotid artery. 8. External maxillary artery. 9. Left axillary artery. 10. Dorsal artery. 11. Superior cervical artery. 12. Vertebral artery. 13. Humeral artery. 14. Radial artery. 15. Collateral of the cannon. 16. Coronary branch. 17. Posterior aorta. 18. Cardiac trunk, distributed to the stomach. 19. Mesenteric vessels. 20. Renal artery. 21. Spermatic artery. 22. Posterior vena cava. 23. Venae portse. 24. External iliae artery. 25. Internal iliae artery. 26. Subsacral artery. 27. Fem
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