ISO the Art of Farriery 



times forty or fifty Miles together, without ever a 

 Bait, and after giving him a genteel Lafli or two 

 over his Buttocks with their Whip, turn him over 

 to the Care of a drunken lazy Fellow, who has no 

 more Humanity than themfelves, 'till fuch Time as 

 thty have Occafion to mount next Morning. And, 

 it may be, the poor Horfe undergoes almoll the fame 

 Fate for two or three Days fucceffively, by which, 

 i^ he had not a good deal of Meat in him, as the 

 Saying is, before he fet out, 'tis ten to one but he 

 falls into fome dangerous Dillemper afterwards. 



I mufl not omit what the laft mentioned Author 

 fays with relation t© the Air affefting Horfes with 

 Colds. He tells us, " that fom.etimes many of the 

 *' Symptoms will happen (I fuppofe he means 

 ** Symptoms of a Cold) when the Air is too much 

 ^' rarified and thin ; for by that Means its PrefTure 

 " is not fufficient to force the Blood thro' the fmall 

 ** Veffels of the Lungs, but will occafion a Stegna- 

 " tion there, and caufe a Difficulty of Breathing, 

 ** which will be accompanied with a Cough, ^r.'* 

 Mr. Cnlf&ns^ Now any Man who has the leafl Notion of Pneu-^ 

 j^ccovint o'-maticks or the Properties of the Air, may fee that 

 roneou"' ^^* ^^V°^ ^^as ignorant of this Part of Natural 

 Philofophy ; for if he had not, he would have been 

 quite of a different Opinion ; becaule when the Air 

 is moli rarified or thin, it is then moll elallic, or 

 prefles harder, or with more Weight, upon all Bo- 

 dies. Andthismaybeeafily feenbyany one, (who 

 has not had the Opportunities of feeing Experiments 

 in Philofophy) if a Bladder half filled with Wind, 

 and tied, be held near the Fire, fo as the Air with- 

 in it may be rarified, how it will fill and ftretch 

 enough to burft out its Sides ; or if he only obferves 

 the Working of the Barometer, (or Quick filver in 

 the Weathei'-Glafs, ) he will find that when the Air 

 is thinneft, ( as Mr. Gihfon calls it, ) it then ap- 

 proaches the neareft to what we may term pure Air, 

 and that therefore it is the moft fpringy or elaftick ; 

 and by its perpendicukr PreiTure at fuch Times, it 



forces 



