In the faid Fig. between B. C. D. H. I. are reprefent- 
ed the exceeding fmall Branches, with their feveral (mail 
Parts iffuing out of the faid Branches 5 and between E. F. 
and G. there lay a Branch that was almoft Angle, upon 
which the Painter has alfo reprefented the round Parti- 
cles growing upon the fame. From which Sight we 
may very well conclude how the Fibrous Parts repre- 
prefented in Fig. 1. are compofed, fetting afide the 
Veins and Arteries which run through the fame. 
A few weeks ago there came two Engli/h Gentlemen to 
my Houfe, who askt me fome Queftions about the Sting 
of a Flea 5 buttho I could not then (how them the fame, 
yet afterwards it happened, that in differing of a Flea, 
in order to take the Heart out of the Body, the Sting of 
the faid Flea appear’d to me much more plainly than I had 
ever feen it before , and the more by reafon that I had 
broke off the two Fore legs, which are as it were join’d 
to the Head, and then plac’d the fore part of the Flea 
before the Microfcope juft as if it lay upon its Back $ by 
which means the Sting of the Flea appear’d fo diftin&ly, 
that I my felf could difcover an Orifice in the extream 
part of the fame, and moreover it appear’d to me that it 
had a Cavity throughout $ but that which furprized me 
moft was, that the Sting of the faid Flea had a Scabbard 
or Sheath, in which the Flea (hut up his Sting when he 
did not ufe the fame, and to preferve it from any hurt $ 
and I imagin that the Flea could fo order his Sting with 
the Cafe thereof, as to place it between his Legs, that it 
might not be entangled in his Hair or Wool when he 
run along. 
This Scabbard of the Flea is divided into 2 parts, and 
each of them has a Cavity like a Canal, in order to con- 
tain the Sting when thofe Parts are clofe fhut together .5 
but that which was moft remakable to me was, that each 
of thofe hollow Parts, that compofe the Sheath or Scabbard, 
was compos’d of Parts like the Teeth of a Saw. Thefe 
Teeth, 
