( 260 ) 



tlie Limner a microfoopc, ht^fore which was placed an exceeding 

 fmall piece of the flefliy part of a duck's heart, direcJ-ling liim to 

 make as accurate a drawing as poflible, of theobjedl wliicli prefented 

 itfch" to him. 



F/ij. 14, ABCDEFGHIKLM, reprcfents tiiis minute particle 

 magnified, in vvliich may pkiinly be Teen, not only how evcrv 

 fingle flelhy particle is united or linked to the adjoining one, but 

 alfo, how all the flelhy particles, Ihewn in this figure, are con- 

 nected, chained or linked together. 



As to the vacant fpaccs apjiearing in this figure, two of which 

 may be feenatBCD, and UNI, we mull not fuppofe, that the 

 fielhy parts are fo far aiunder as the drawing reprcfents, for I am, 

 fully perfuaded, that, when the heart is in its natural Itate, all tlie 

 flefliy particles of which it confilts, are fo clofe to each other, that 

 nothing but an exceeding thin membrane intervenes, within which 

 membrane the blood-veflels take their courfe ; and there alfo, may 

 fometimes be feen particles of fat, ei'pecially where the blood veiVels 

 are larger than ordinary. 



Farther, I always obferved, not only in tlie hearts of an ox and 

 flieep, but alfo in that of a duck, all the flelhy particles, which, 

 when defcribing them mfig. 13, I have called mufcles, but which 

 I cannot here call by that name, becaufe they are not enveloped by 

 membranes peculiar to themielves ; thefe particles, I fay, whicii 

 in fig. 4,, are exhibited at LM or AB, I found, again to confift of 

 great numbers of flender oblong particles, which often leparatcd 

 from each other, and at little di Ranees united with other particles : 

 but thefe fmaller particles are not reprefented in the figure, becaufe 

 they had become ib dried, as not to be viiible to the Engraver. 



\\c may now figure to ourfelves, that the particle of flefli, which 

 ^g. 4, exhibits at A B, again confilfs of an hundred and more oblong- 

 particles, and, that a little above A B, they arc divided into four 



