^ ^pje Jrt of Farriery 



the Mufcle is cut, tied, or otherwife obftrufted • 

 as in the Cafe of a Palfy, fe'V. AnA therefore we; 

 conclude, that the Contra 6lion, Swelling, or Mo-" 

 Motion of tion of the Mufcles, is performed by the Blood anc 

 W^^^ir-^^' Animal Spirits, diftending or ftretching the Vefich 

 formed. ' ^^ Bladders, which are the Cavities of the Fibres 

 And this Diftention of the Veficles of the Fibres, 

 muft be, either by their being filled with a greate 

 Quantity of Blood and Animal Spirits than th< 

 were before the Contrailion, or the Blood anc 

 Spirits mixing, muft rarify and fill up a greater 

 Space. 



That the Veficles of the Fibres are not diflended, 

 purely by the Quantity of Blood and Spirits, will 

 appear if we confider, that were the Veficles diftend- 

 cd only by the Quantity of Fluids contained in 

 them, Nature (whofe Operations are always the 

 moft fimple) had only ufed one Fluid, and not two; 

 for in the Works of Nature, we no where find two 

 neceilary Caufes, where one could have produced 

 the fame EfFed. Now how fmall foever we fup- 

 pofe the Quantity of Fluid brought by the Nerves 

 to the Mufcles, that alone might hav^ contratfted 

 the Fibres, ( if a Quantity of a Fluid only had been 

 neceffary) by diminifhing the Diameters of the Ca- 

 vities or Veficles of the Fibres, as will appear plain- 

 ly to any Perfon, who is curious enough to enquire 

 into the Property of Elailic Fluids with relation to 

 Mufcular Motion. Now to return. 



I think I have already faid, that an Apoplexy 

 proceeds from any Caufe which hinders the Undu- 

 lation of the Nerve?, and that a Quantity of Ner- 

 vous Fluid muft be derived into a contradling Muf- 

 cle, not only equal to that which is deriA'ed at the 

 fame Time into the oppofite Mufcle, but alfo gTe;U- 

 er : I fay, this is plainly fo, otherAvife the Part 

 to be moved would remain in an Equilibrium with- 

 out any Motion at all : And therefore, more of the 

 Nervous Fluid muft pafs into a Mufcle, that has an 

 Antagonift, than into that wliicli has none : But the 



Heart 



