TOf The Anatomy ^/ ^ H O R S E. 



conftant Supplies, as there" are continually fome Dregs and 

 Excrements exhaling through them. 

 Of hryirbl ^^^ ^^'^ ^''^ appear dill more evident, 



*Ira»fpiration. ^'^^^i we coniidcr, bcfidcs the Effluvia that 

 go off infenfibly in this Manner through the 

 Pores and Interllices of the Body, that moft of the Glands 

 are continually Separating fome Part of the excrementitious 

 Matter of the Blood ; though all that is difcharged by the 

 Mouth and Nofe, by Urine and Dung, and by Sweat, or 

 any other feniible Way whatfoever, does not near amount 

 to the Difcharge that is made through the Pores by infen- 

 fible Tranfpiration. This is fo palpable a Trath, and has 

 been fo well proved by the Experiments oi Sanclonus, that 

 ihere need^ be nothing farther faid about it ; and therefore 

 we may conclude, that fince the Bodies of all Animals are 

 thus compounded, and made up of Matter which is full of 

 Pores amd Interlaces, and maintained by Juices, which are 

 again capable of being diffipated and waited through thpfe 

 Pores, there muft be continual Supplies of Food to maintain 

 ihofe Bodies in an uniform State. 



Now it is plain, that all Bodies fuffer a Diflipation and 

 VVafte, if the Quantity of the Aliment be abated : For in 

 fuch a Cafe we obferve any Creature grow lean and emaci- 

 ate. It is alfo evident, that all fuch iuffer by Excrcife, by 

 hard Labour, by Want of Reft, when it is the ftatcd Time 

 of Sleep ; and by many other Ways, not neceflary to be 

 mentioned. And therefore all Creatures are under an in- 

 tiifpenfable Neceffity both of Feeding, and raking fuitable 

 Reft, to make up the Wafte and Decays of Nature ; for as, 

 often as there is a great DilTipation by Labour, or by any 

 other Way, the fmall Fibrilla are thereby abraded and 

 •wore by the quick Motion the Blood and Spirits were in 

 during that Exercife ; or even, if the Body was not in 

 Exeicife, it will fuffer by the conftant Activity of the Spi- 

 rits themfelvts ; fo that a ftated Time of Reft muft alfo be 

 neceliary for all Bodies, as well as Food. For when the 

 Body is at Reft, the Spirits are, as it were, luU'd and laid 

 alleep ; fo that the Blood acquires, during that Time, a 

 more uniform and gentle Motion, and is more equally di- 

 ftributed into all Parts, and thereby fills up all the vacant 

 Sp;;ccs that are made during the Time of Excrcife, tf^c. 



But it may be expeded, before I put an End to this Dif- 

 ccurfe, that I fhould (j^y fomewhat more particularly con- 

 cerning Secretion i but I Ihall only obferve in general, thac 



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