that affift in the expanfion thereof. The exquifite neat-" 
nefs with which this minute wing was folded under the' 
•fhields, is furprizingly beautiful, as appears between G H. 
With what wonderful nerves muff thefe minute wings be' 
ftrengthned, that can enable this infedt. fo readily to fold' 
up the extremity of this filmy membrane in fo neat a 
manner, and to expand it again, as it were inftantane- 
oully, whenever it. is inclined to fly ? That the curious-' 
folding of thefe fort of wings might be comprehended,, 
Mr. Leeuwenhoek took off one of the fiielly cafes aneb 
placed the wing before the microfcope, which appeared 
as in'fig. in. QJS T V W X Y reprefent the wing as. 
it lay covered under its fhield. It was broadeft about V 
the fecond wing, which I fuppofe to be its ballance or 
poize, is fhewn at ST. The extremity W X.Y, fhews', 
thofe neat foldings before fpoken of, which* together 
with the ftrength of the nerves,: difeover the Almighty’s 
wifdom in their contrivance. 
I have found thefe infedt flies in fummer-time flying 
about my workfliop, and have obferved them to anfwer 
all the above defeription. They are fo fmall, that I 
have applied them to the microfcope in the ivory 
Aiders, but they are better feen when applied in the 
nippers. 
There is- likewife a fmall fcarab in the very tips of 
elm- leaves s . In the fummer many of thefe leaves may 
be of Cerved to be dry and withered, and alfo turgid, in 
which lies a dirty, whitifh, rough maggot, from which 
proceeds a beetle of the fmalleft kind, of a weefel-colour ; 
it leaps like a grafhopper, although its legs are but Ihort, 
black eyes, vaginae thin, and prettily furrowed, with fevera.l 
cavities 3 fmall dubbed anteniue, and a long probofeis. 
The 
s Phy. Thee. p. 251-, 
