and Circulation of the Blood « 135 
and extending the Mufcles before the Micro - 
fcope , by the fame Means as we had done the 
Skin, we had the Pleafure of viewing their 
Structure, which we found to conflft of 
Bundles of tranfparent Strings or Fibres, 
lying parallel to one another, and joined 
together by a common Membrane. Thefe 
Strings or Fibres appeared through their 
whole Length made up of minute roundifh 
Veiicles, or, in other Words, feemed like 
Rufhes divided the long Way. We could 
not be certain of any Circulation through 
the Mufcles, though fometimes we imagined 
we faw a very flow Motion of fome trans¬ 
parent Fluid : but the Objedt growing dry 
and rigid, obliged us to leave that Enquiry 
to a farther examination. 
We then proceeded to our lafl: Experi¬ 
ment, which was to draw out gently a Part 
of the Frog s Gut, in order to apply the Me- 
fentery to the Micr of cope: and herein we 
fucceeded fo happily, that I believe the Cir¬ 
culation of the Blood was never before feen 
in fo diftindl and fine a Manner. No Words 
can dpfcribe the wonderful Scene that was 
prefented before our Eyes ! We beheld the 
Blood pafling through numberlefs Veflels at 
one and the fame Inftant, in fome one Way, 
in others the quite contrary. Several of the 
Veflels were magnified to above an Inch in 
Diameter, and the Globules of the Blood 
rolling through them feemed near as large as 
Pepper- 
