c ; 
ture, or an Egg thraft into their Bodies, where it re- 
ceives its food and growth, and then makes its way out 
of tlieir bodies again. 
I had (hut up ^lefe dead Lice about eight days, when 
I obferv'd two Httle FUes, of quite another make, in 
Wings, Colour and Shape, leaping about the Glafs. 
I Qiifted thefe Flies into another Glafs Tube, where 
I had before put fix Green Lice, which I had taken 
irom the Leaf of a Currant-tree, and thofe of the 
moft full grown, and yet they were not come to that 
perfeftion, as that I could obferve thofe parts which ' 
were to become Wings, 
Thefe Flies, as foon as ever they came near the faid 
Lice, brought the hinder part of their Body, which 
was pretty long, between all their Feet, and ftretcht 
their Body fo far out, that their Tail making a kind of 
femicircle with the reft of the Body, fas you may fee 
in the Draught annext) ftood out l3eyond their Head, 
and in this manner they infinuated their Tail into the 
Bodies of the Worms, and this the Fhes did in a (horc 
time to all the Worms they came near to 5 but that 
which was moft remarkable in this Aftion was, that in 
this conjunftion they never toucht the Lice, either v/ith 
their Feet or Bodies,they being much too ^ycle or large 
to approach thcm.ib that they often effay'd to approach 
thefe Creatures, in order to thruft in their Tails into 
their Bodies,and could notefFettit 3 nay,one would fay 
they were fo afraid of thefe Lice as if they would have 
devoured them 5 and as they entred the Bodies of the 
Lice they made a TriUende motion or ftiaking with their 
Tail, which come to be done that they might thruft it 
in the farther. 
Now as the Flies remained but two days alive with- 
out Copulation, as ever I obferv*d, whereas the Green 
Lice lived feven or eight days, I thought no other- 
wife 3 but that the Flies by that infinuation of their 
Tails 
