Here I obferv*d that thefe Flies had not hithet^o 
e^idamag d either the Leaves or Bloffoms of the Trees. 
I was confirm'd in this opinion, after I had ftridly 
examind the Inftruments which tiiefe Fhes have on 
their Head, and found that they were not of a fit fhape 
to bore into Leaves 5 from whence I conclyded that 
thefe Black Flies got their Noarifhment only from the 
Juice or Sap that Hows out of the Leaves. 
As the Glafs Tube was Blown together at one end, 
and fo ftopt with a Cork at the other, that there might 
be a Free Paflage for the Air, I obferv'd that even that 
Paflage was fo ftopt by the Perfpiration of the Leaves, 
the Flies, and the other little Creatures, that none of 
them could get out, but died away, glew'd as it were 
with the Moifture of the fides of the Glafs. I fancied 
too that the Cliange of Air in the Tube might qontri- 
bute fomething to the untimely Death of the Flies, 
therefore I took another Glafs Tube, and put into it 
fome of thofe Flies, and a few Leaves on which (everal 
of the little Lice were, and covered both ends with fine 
<3awfe, fo that there was a free Circulation of Air^ 
for I thought that the Eggs which they laid before 
were untimely and abortive, as it ofteii has happen d 
on the hke occafioTis, 
Thus far Lhad brought matters on the 20th of Maj^^ 
when I obferved that' the Flies which I had fhut up 
ifjere not yet big wrfkEgg, I obfervU aiCo thai] ttere 
were not near fo many Flies upon the Trees as tkexe 
had been three days' before. 
Being inforniYi that our Sea-Giore was all Black with 
Flies, I repair'd thither to fee whither they were of the 
fame kind with thote upon the Trees, .but I could not 
find one Fly ^ and they told me there, that the Flies 
ftakl but two days ^ ai:id that, the firft time riiey were 
fpied, chey were vv^aflit away by a great raiiT that fell 
the next night, and fo it happened again the night at> 
..L 1 11 i 2 . , ret 
