Chap. II. The Anatomy ^/^ HORSE. 17 



dy fomewhat white and round, called the Paraftata ot 

 Epididima: ; from eacli of thefe runs a pretty large Vefiel, 

 ■which empties itfelf into the Seed-bladder, fituated on eacli 

 iidiQ the Root of the Yard, and on the infide of the Share ; 

 thefe are called the Dtferentia^ or the Vefleis which carry 

 back the Seed : Both the Defer entia and the Blood- vellels, 

 above defcibed, are inclofed in a Capjuia or Sheath, which 

 is a Produdion of the Perltonceum^ proceeding from the 

 lower Belly on each Side, which not only ferves for this 

 ufe, but forms the outermoft Cover of the Stones, and 

 is that which Anatomifts call the Tunua Vaginalis. 



Each Stone h^.^Cremafier or fufpen- c^^.i, Mufdes. 

 fory Miifcle, to araw them up m time of 

 Copulation, which ariling from the Ligament of the Share- 

 bone, expands itfelf all round the infide of the Tunica 

 Vaginalis ; and, according to Mr. Snape^ forms their fe- 

 cond Coat. Befides thefe, the Stones have an innermolt 

 Coat or Cover, which is thick and nervous, and not only 

 contributes to their Warmth, but is a great Defence to their 

 true Subftance, which confifts of a very fine Clue of Vef- 

 it\ made up of Veins, Arteries, and Nerves, and form'd 

 out of thofe above defcrib'd 5 fo that the Liquor palTing 

 thro* fo many Circumvolutions and Turnings, in Veflels 

 which are infinitely fmall, it is thereby fo often ftrained 

 and refined, till it becomes fit to enter into the Parajlata ; 

 where probably undergoing fome further degrees of Re- 

 finement, it is compleatly form'd into Seed. 



There are feveral glandular Bodies fitu- ^he Proftrates. 

 ated at the Root of the Yard^ immediately 

 before the Seed-bladders, and are therefore called Pr^rj/<?;^ 

 Thefe feparate a clear flimy Matter, which being forced 

 out in lime of Copulation, no doubt preferves the Urinary 

 Paflage from the Pungency of the more fpirituous Parts of 

 the Seed ; and may at other times, in conjunction with the 

 Mucus which is in that Pailage, defend it from the Heat and 

 Sharpnefs of Urine, Sand, or other gritty Matter fent into 

 it from the Bladder. 



Having given this (bort Account of the Genitals of a 

 Horfe, we come in the next Place to thofe of a Mare* 

 v/hich differ from the other, not only as they are all con- 

 tained within the Cavity of the. ^z\Vj^ but iikewife as to 

 their Figure and Ufe, 



A Mare has two Tefics or Stones, as well ^he Parti of a 

 as the Horfe, which Y\& backwards on each M>!re, 



