IMPROVED. lai 



Force from the antecedent Blood in the Arteries 

 mull be greater to raife a perpendicular Column of 

 Blood in the Veins, than is required to raife a Dia- 

 gonal one, which is, when the Head is little lower 

 than the Body. And nothing evinces this Truth 

 more, than what we obferve in ilck weakly Perfons, 

 to wit, that they will bear twice the Quantity of 

 I bod to be taken away from any Part of the Body 

 without being fick, when they lye upon a Bed or 

 in a Horizontal Pollure, than they can do in an 

 ere£l or upright one ; becaufe, in the latter, the Co- 

 lumn of Blood in the Aorta or great Artery rifmg out 

 of the Heart, prefTes fo heavily againil the left 

 Ventricle or Cavity \n the left Side of the Heart, 

 that it is fcarce able (in it's Syflole or Contraction ) 

 to raife it, in Order for Circulation. And the true-^-^^j^ p^ 

 Reafon of weak People's not being able to fit ere6l fons ealier 

 without Sicknefs proceeds from the like Caufe, jufl in a Hoii- 

 now aiTigned. So that even from this minute Cir- z::inral Poi- 

 cumftance of a Prone or an Erec^ Pollure, feveral ^"eft one!'' 

 Feats may be performed with relation to Hasmor- 

 rhages or Loffes of Blood, which to the Vulgar 

 would feem almoll unaccountable. And, in my -.tt. 

 Opinion, there can be no other Reafon given, why Horie is 

 a Horfe is not fick (or at leall not fo to appearance) not Sick 

 during the Operation of Bleeding, than the Hori- "^^'hen Bled. 

 zontal Poilure or Situation this Creature is formed 

 in ; for, as I jufl now faid, when an Animal is in a 

 Prone or Horizontal Situation, there 's not that 

 Force required in the Heart to drive the Blood round 

 the Body in its Circulation, as there is when in an 

 upright or ered one. 



I know no one Thing v/hich more endangers a l.ow-keep- 

 Horfe's Eye-Sight, than of a fudden to turn him 'rg after a 

 from good and warm Keeping (I mean what is^^^rieha? 

 commonly underflood by high Feeding) to a wo^fe ;-^'" ^j^^ 

 kind of Living; for I have been a Witnefs of itper.^hisEyc- 

 feveral Times, and have obferved, that when by Sight, 

 turning a Horfe from good to very low Keeping, 

 his Eyes have grown dull and funk in his Head, fo 

 G that 



