( 59 ' ) 
To thefe Obfervations of Mr. L r ewtnhe?ck I fhall join, 
fir. An Extract from the Journal Literaire, PubliJFd at the 
Hague, for the Months of January and February, 1714, 
Pag. 238. Being, 
An Account of fver al Obfervations concerning the Frame and Tex- 
ture of the Mufcles; By Mr. Muys of Franequer: 
H E Celebrated Mr. Muys$- who always ads for the Ho- 
nour of the Academy of Franequer , and Advantage of 
Students in Phyfick and Anatomy, has made feveral Difcove- 
ries, as to the Mechanifm and Texture of the Mufcles of 
Animals; of which thefe are fome. 
He has obferved, that the flefliy Fibres of the Mufcles 
are compofed of other fmaller Fibres, which he calls FibrilU : 
that thefe FibrilU are of the fize of a flender Hair, and that 
yoo or 600 of them, may be counted in one Flelhy-fibre, 
whofe Diameter is no more than a zqth part of an Inch. 
That each of thefe FibrilU alfo is made up of more than 
300 little tranfparent Tubuli, but fo {lender, that if a Blood. 
Globule (which, according to Mr. Leutvenhoek , is but the 
1, 000,00c th part of a grain of Sand) were divided into 14 
parts, one of thefe could hardly pafs thro’ thefe (mall Pipes. 
He has fhewn, that tho’ the flefhy-Fibres of the Mufces, are 
joined to the Tendons and tendinous Membrane of a Mufcle; 
yet thefe tendinous Fibres are not a continuation of the flefliy 
ones, as moft Anatomifts fuppofe: which he proves thus; If 
by means of a wooden Knife, or only by pulling it, you 
feparate the flefliy Fibres from the Tendon, the end of the 
Tendon to which they were joined, will remain fmooth and 
even, and not rugged. 
