C3n] 
of a fand, thefe I had never feen in the pure blood, nor 
could I perceive them in the water that came out upon 
ripping the skin from the fiefh, omponopening the bel- 
ly, or fqueezing the head of the Fxog to make it lye quiet 
upon the Plate. At length in the moneth of June I met 
with fome /r<?g^/ whofe excrement was full of an innume- 
rable company of living Creatures, of different forts and 
fizes, the greateft fort were fliaped like Fig^, F and of 
thefe I judged that 40. might be in the fpace of a fand. 
The zd. fort had the ihape of Fig. G. thei'e were but few 
in number. The 3^ fort was like our River Eeles as Fig. 
H. and thefe were more in number then the firft; But 
the whole excrement befides was fo full of living things, 
that it feemed all to move, 6c I gueft there was not lefs 
then 1000 of the third fort in the fpace of a fand. From 
hence I concluded that the Animals found among the 
blood might come from my cutting a Gut. 
By the way I obferved fomethingof the dammage that 
frogs may do to fijh-ponds^ for T took out of fome of their 
Stomachs 8. 10 or moreyoung^y&^j*. 
I took notice of a fmall vein, of about the thicknefs 
of a hair of my head, that when the blood was out of it, 
the Coat was like ^frogs outward skin. 
The fame Coat of the vein was made of threds or fi- 
laments runing by the fide of one another, juft as if they 
had been wound clofe about a fmall round ftich, fo as to 
cover it all over. Now if there be Capillary s in the body 
a 1000 times lefs then this which 1 examined, how thin 
mufl the threds neceffarily be of which the Coat is made ? 
and how eafily muft thefe threds be feparated and devided 
from one another, fo as to let the blood when it is very 
forcibly moved in the -^r/^^ry/, flart out between them ^ 
and I was the more confirmed in this Opinion, upon 
fpreading hard the Coat of the vein, for I then faw 
through it as through a hair five, hence may a probable 
account be given of St. Anthonys fire^ vt^ fmiltngs,ot 
A a a the 
