30 Of the mufcular Fibres of Animals. 
that what he has faid of the membranes encompaf- 
fing the fibres and fibrils of whale-flefh, will alfo hold 
true in other kinds of flefh, even down to that of a 
rat or moufe. 
Mr. Muys confirms the foregoing obfervations on 
the fiefbty fibres of the mufcles, being compofed of 
fmaller fibrils, and computes that 500 or 600 of them 
may be reckoned in one flefhy fibre, whofe diameter 
is the 24th part of an inch, r and that each of thefe 
fibrils are alfo made up of more than 300 tranfpa- 
rent tubuli, but fo fender as not to admit a 24th 
part of a fingle globule of blood. He has fhewn, that 
though the flefhy fibres of the mufcles are joined to 
the tendons, and tendinous membrane of a mufcle ; yet 
thofe tendinous fibres are not a continuation of the 
flefhy ones, as is generally fuppofed. He found that 
upon injecting warm water into the crural artery of a 
lamb of a year old, all the flefhy fibres loft their red- 
nefs and become white. He then injedted a colour’d 
liquor into , the fame artery, upon wdiich not only the 
fmall arteries appear’d replete with the tinged liquor, 
but that it had alfo pafled through each fibre. He 
alfo obferved, that feveral branches of the arteries now 
became vifibly fpread round the fmall fibrils, and tinged 
with the fame liquor; and upon examining the parts 
of the flefhy fibres, near the extremity of the arteries 
with a microfcope, found the fmall fibrils filled and 
tinged with the fame liquor ; and not the leaft ap¬ 
pearance of the liquor in the interfaces between the 
fibrils. And upon injedfing another colour’d liquor by 
the crural artery, he faw not only the fibres in fome 
of the mufcles, and moft part of them in others, filled 
with this matter, but upon examining them' in a good 
mi- 
? Phil Tranf. No, 339: 
