( 26"3 ) 



which, in the iigiirc, appears between the letters G and H, or, the 

 lize pii^tured at X. 



Seeing now, that tills flediv particle, though noi; in fa6l, larger 

 tlian the fpace between G and H, or at X, does yet confjfi: of more 

 tlian an hundred dillinct oblong particles, as I can affirm from the 

 molt exa(il: computation of my own view, and. that this is not 

 only the cafe, in the heart of a duck, but alfo in that of an ox ; and 

 moreover, that each of thofe (lender, ob'ong, component j)articles, 

 again confifls of a great number of excelJivcly minute particles, we 

 (hall more and more be ftruck with wonder, at tiiis formation of the 

 lieart. And who can tell, into how many I'mall particles, entirely 

 undiicoverable by us, thefe lait named particles may be again divided ? 



We find, that in the commoji mufcles of the body, thofe fmall 

 mufcular parts, which conftitute a large mufcle, may be feparated 

 from the larger one, often without tearing the oblong flefhy 

 parts which compofe it, nothing being broken, except the thin mem- 

 brane with which the fmall mul'cular jjarts arc, as it were, enveloped ; 

 for, all tliofe (lender, oblong, flclhy parts, lie difpofed in regular pa- 

 rallel order, befide each other ; and, at th.eir extremities, are united 

 to a membrane which furrounds the mufcle, or, rather, forms the 

 tendon of that mufcle, which in faft the membrane does : hence we 

 may eafily comprehend, that, when any part of a common mufcle is 

 wounded, the part which remains uninjured, may (till, in fome de- 

 gree, perform its funcStions ; becaufe, as I have before laid, the fmall 

 mufcles which compofe a larger one, are only connec^^ed by a kind of 

 membrane : but, on the contrary, when any one particle in tlie 

 ilelhy fub(hincc of the heart, inch as is reprcfented in j^V. Tfy at 

 A BCD, or any other particle though much mere minute, is wounded, 

 the whok\flefli or fubltance of the heart, (by reafon of the intimate 

 union of its parts) not only firiiers, but, through the violent and con- 

 liiiual agitation of the heart, in the protrufion or expelling the blood 

 3 



