5q ^^^ ^^^ of Farriery. 



F/>y?, I fay, the Ventricles or Cavities in the 

 Heart of a Horfe, of a middling Size, are each of 

 them capable of receiving four Ounces of Blood, or 

 more ; and therefore, being in their Diafiok or Di- 

 latation, we may fuppofe that they throw out at leaft: 

 four Ounces of Blood in each Sy ftole or Contradi- 

 on. The Heart of this Creature contrails about 

 1 800 Times in an Hour, which is about ane half 

 flower than in Man ; (I would be underftood in a 

 Healthful State ; ) but even this varies in feme Mea- 

 iure according to the different Temperaments, Sexes, 

 The Qiian- and Ages : Ic is fuppofed there pafs through the 

 tity of Heart of a Horfe 1 800 Times four Ounces, or 450 

 cil^tlr^' P°"^^ o^ ^lood., in an Hour. Now the common 

 received Opinion is, that the whole Mafs of Blood 

 in Man is about 2 5 Pounds, and in a Horfe fix Times 

 as much ; and therefore, according to this Allow- 

 ance, a Quantity of Blood equal to the whole Mafs 

 pafles through the Heart ten Times in an Hour In 

 Man, and in one Hour and twelve Minutes in a 

 Horfe. And from hence may be obferved, how 

 neceffary it is to take away greater Quantities of 

 Blood in many Cafes, than is commonly pra(5lifed ; 

 for what fenfible EfFeft can the taking away a Quart 

 of Blood from a Horfe have upon him, if we con- 

 fider that he has near 225 Times as much in his 

 Body ; or how much we may depend on what is 

 called making a Revulfion, or drawing the Humours 

 off by Bleeding in the Tail ? For Example, when 

 the Diftemper affeds the Eyes, I fay, in my own 

 Thoughts, little, nay very little, Strefs can be put 

 on the Praftice, feeing the whole Mafs of Blood 

 pafTes through the Heart in an Hour. Therefore 

 the Benefit of Bleeding aca-ues from the Quantity's 

 being lefTened, and more free Liberty or Room 

 thereby given to the remaining Part. It is very fur- 

 prizing to confider, how far the old Writers have 

 been carried out of the true Do(flrine and Nature of 

 Things, by falfe and outward Appearances, fuch as 

 thofe I am fpeaking of j and their Unwillingnefs to 



fearch 



