736 



THE CIECULATION. 



of the body is also taken up by the blood and carried off through 

 the bowels, lungs, kidneys, and skin, which are the natural 

 sewers or depurative channels of the body. The quantity of blood 

 that a horse contains is about j^ of his weight. A horse weigh- 

 ing 1,000 lbs. would therefore have about 100 lbs. of blood 



or 



Fig. 626. — The heart and principal vessels ; left face. 



a. Right ventricle; b. Left ventricle; c Right auricle; d. Left auricle; e. 

 Pulmonary arterj'; /. Pulmonary veins; g. Anterior aorta ; //., Left axillary artery; 

 /. Right axillary artery, or brachio-ceplialic trunk; p. Carotid arteries ; </. Posterior 

 aorta; x. Venaazygos; y. Thoracic ducts; z. Embouchure of that vessel, placed 

 near the origin of the anterior vena cava. 



nearly 50 quarts. Fat horses have proportionately less blood than 

 those that are lean ; and it is claimed that wild animals generally 

 have more blood in proportion than the domestic ones. Forty 

 pounds of blood have been taken from medium sized horses with- 

 out serious inj ury ; and it requires the extraction of about i^ of 

 the total weight before life is destroyed. It is a remarkable fact 



