( ) 
Teeth, l conclude, are fo made as to indent one within 
another when the Sting is in the Sheath, in order to hin- 
der the opening of the fame at any other time than when 
the Flea would make ufe of it : Yea, that which is moie, 
we difeover’d at the end of each of the Scabbards 3 
Teeth Banding out, which I judge was for no other end 
than to fhut within one another. 
1-caufed the Sting with the Sheath thereof, fo as they 
appear’d through the Microfcope, to be drawn by my 
Painter, to the end, that one may comprehend the bet- 
ter the wonderful Figure of this Inftrument in fo defpi- 
cabte a Creature as a Flea is. 
In Fig. 4. L. M. {hews the half of the Scabbard of the 
faid Sting, as alfo the Cavity therein, and the Teeth-like 
Saws, and the 3 Teeth at the end of it deferibed by M. 
In the faid Fig. 4. N. O. reprefents the other part of the 
Sheath, that is likewife adorn’d with the fame fort of 
Teeth. Q_P.is the Sting it felf, placed between both the 
Parts of the Scabbard, and P, reprefents the little Orifice 
or Hole in it. 
Now if we fuppofe that each of the Parts of this 
Sheath, as alfo the Sting it felf, are furnifhed with divers 
Mufcles and Fibres neceflary to produce all the motions 
that belong to them, the faid Sheath and Sting may be 
deemed great Inftruments, in comparifon of thole Mufcles 
that produce their Motion ; But then if we remove our 
Thoughts to thofe Animalcule that many millions fmaller 
than a Flea, and confider alfo their refpe&ive Inftrments 
for motion, &c. we cannot but be exceedingly amazed 
at the thoughts thereof. 
London, Printed for Sam. Smith and Benj. Wolford, Printers- 
to the Royal Society, at the Primt'tArm in St fWT 
Chunh-jard, 170 6 , 
