31 



AN 



OUTLINE 



of 

 THE GENERAL FORjMATION, STRUCTURE, 



AND 



Economy of the Horfe. 



-IL H E body of a quadruped is moft curioufly made 

 up of a great number of parts, as bones, mufcles, 

 membranes, veflels, nerves, vifcera, &c. A general 

 outline of thefe parts, particularly of thofe more in- 

 ternally fituated, I have endeavoured to convey ia 

 the plate forming the frontifpiece, which reprefents 

 a headlefs horfe on his back, with the belly cut open, 

 and his inteftines removed ; the letters referring to 

 the following parts: <7, the windpipe, h, the gullet, 

 or food paflage. c, the great vein, called the ante- 

 rior cava, from the right fide of the heart, dividing 

 into four branches, two of which furnifli the fore 

 legs, and two of them form the jugulars, or neck 

 veins. Immediately by the letter c is feen the 

 thoracic duct entering the cava : the thoracic du^ 

 is the canal that conveys the chyle, or nutriment, 

 fucked by the laclcals from the food in the inteftines,, 

 and is feen palling up between the two great blood, 



D3 



