C 45 3 
II. 
There is not the leaft Motion performed in any 
Part of an animal Body, which does not depend on 
a mufcular Stru&ure for its Progrefs, whether in the 
Fluids or Solids, voluntary or involuntary ; and there- 
fore whatsoever Explanation of mufcular Motion is 
not reconcileable to, and accountable for, every Mo- 
tion performed in any Part, cannot be the true Ex- 
planation. 
III. 
Of a mufcular Fibre . 
The moft minute mufcular Fibre *, that I was 
able to Separate, feems to be tubular, but unequal 5 
that is, having fome Parts of it more protuberant 
than others, fo as to refemble as many Sailors Ham - 
mocks one after another, and much in the fame 
Proportion in general : We fhall call thefe Bellies or 
Flammocks, Cells, for the better Explanation of the 
Subjed. Now tho’ it is a received Opinion, that 
Fibres are divifible in infinitum , that is, that each Fi- 
bre is compofed of others, and thofe again of others* 
and fo on 5 yet this mufcular Fibre , as it is a Tube , 
and 
* A mufcular Fibre of a middle Size is about equal to the Hair of 
a Child’s Head newly born, at the Strictures or imalleft Parts ; the 
Cells being thicker according to the Proportion at Tab. I. Fig. 1, 
2, 3, &c. Yet fome are larger, and fome fmaller j the Cells however are 
not to be difcerned with a Glafs of a lefs magnifying Power than 
the Fifth of a double reflecting Microfcope. 
