[ 46 ] 
and ferves to perform an Office peculiar to itfelf, it 
cannot be divided, without deftroying its necefiary 
Form; as a Trumpet, or any other hollow Vefiel, 
cannot be divided or cut into other Trumpets, &c. 
(let its Size be what it will) and is therefore, pro- 
perly, an ultimate Tube or Trumpet , as this tubular 
Fibre is an ultimate mafcular Fibre ; and this is the 
Cafe with the nervous Tubuli. Indeed the Tarietes 
of every mufcular and nervous Fibre may be com- 
pofed of Fibres divifibie, for what I know, in infi- 
nitum . 
IV. 
Thefe Cells are not regularly alike, fome appear- 
ing three times longer than others, nor at the fame 
Diftances from each other; nor do the Fibres them- 
felves feem all of a Size, (Fig- I. i, z, 3, &c.) and 
confequently each Fibre contains fome more, fome 
lefs of thefe Cells. 
Y. 
The Cells communicate with each other by a Paffage 
through the whole Length of the mufcular Fibre, till 
both Extremities terminate in a Tendon or otherwife j 
which appear'd upon many Experiments both while 
the Mufcle was moift, and after drying a little, hav- 
ing feparated them in both Cafes ; but after being 
boiled or roafted, every Fibre, I examined, feemed 
to. have loft its Cells, and become uniform ; whence 
one would be apt to think the Cells had burft by the 
Rarefaflion of the infiating Matter * they contain’d, 
and 
* Sedt. X. a Hals further. 
