620 



THE PEOPLE'S FARM AND STOCK CYCLOPEDIA. 



rid of urea ; and the skin, which bears off fluid and more or less 

 of solid refuse. 



CIRCULATORY ORGANS OF THE HORSE. 



1. Heart right ventricle. 2. Heart left ventricle. 3. Heart left auricle. 4. Pulmonary ar- 

 tery. 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 can- 

 non. 16. Coronary branch. 17. Posterior aorta. 18. Cardiac trunk, distributed to the 

 stomach. 19. Mesenteric vessels. 20. Renal artery. 21. Spermatic artery. 22. Posterior 

 venacava, 23. Vena poi tee. 24. External iliac artery. 25. Internal iliac artery. 20. Sub- 

 sacral artery. 27. Femoral artery. 28. Posterior tibial artery. 29. Digital artery. 30. 

 Veinous network of the foot. 31. Veins of the leg. 32. Jugular vein. 



The Nervous System. This system of the horse is 

 similar to that of man. It is not so highly organized, and for 

 this reason it is supposed the horse is not so liable to nervous 

 disorders. 



The sense of touch is necessary in man and beast to pro- 

 tect from harm. By it we discern temperature, and get the 

 ideas of hardness, softness, etc. 



It is located, generally speaking, in the nerves of sensation 

 on the skin; and in the horse, the lips and nose are especially 

 endowed with the sense of touch. The lips and feet are espe- 

 cially endowed with nerves of sensation. 



