[«] 
him think thcfe Corrugations were fo marly Vefi- 
cles or Cells 5 but he foon difcover’d his Miftake. 
In fome of the Fibres I could plainly difcern a dark 
Lift running in the Centre, from one End to the 
others but what it was, I could not difcover. 
XL VII. 
3 dly. Having obferved the mufcular Fibres in the 
Leg of a Sea-Crab to divide very eafily and diftin&ly 
from one End of the Mufcle to the others we placed 
a great many of them under the Microfcope, but could 
not difcern any thing like Partitions or Cells. 
XLV 1 II. 
In fhort, Mr. Leeuwenhoek * affures us, that the 
minuteft Fibres that are vifible to the naked Eye 
appear through a good Microfcope to be inverted 
with a Membrane, which includes within it not One 
fimple Body, but a Bundle of ftill finer Fibres, the 
laft, or fmalleft Order of which he thinks to be 
fimple hollow Tubes. 
XLIX. 
This perhaps is as good Authority as we can have 
from the Affiftance of Microfcopes - y but if we may 
be allowed to deduce our Arguments from the Ana- 
logy which the mufcular Fibres bear to fome other 
Parts 
* Phil . Tranf, N°. 367. 
