Of Flies « 45 
plainly fee through every little lens, the whole fteeple 
inverted, though not larger than the point of a fine 
needle ; and then directing it to a neighbouring houfe,. 
faw through abundance of the little hemifpheres, not 
only the front of the houfe, but alfo the doors and 
windows, and was able to difcern diftincily whether 
the windows were open or fhut. 
An eye of a fly thus prepared, may be held between 
the nippers for examination. But the head of any fly 
is bed feen when duck upon a piece of card, with 
feme ftrong gum water, and applied to the microfcope 
under the filver refledtor, which piece may be held in 
the nippers. 
N. B. The horns F F, the feelers G G, the probofeis 
H H, and the hair and brillies K K, fhall be here¬ 
after deferibed. 
Of the wings of flies. 
T he wings of all kinds of infedts afford an infi- 
nite variety, no lefs agreeable to the mind, than 
pleafmg to the eye ; being diflended and ftreng-thened 
by the fined: bones, and cover’d with the lighted mem¬ 
branes. Some of them are adorn’d with neat and beau¬ 
tiful feathers, and many of them provided with the fined 
articulations and foldings, for the wings to be with* 
drawn, and neatly laid up in their vaginae and cafes,- 
and again readily extended for flight. 
This of the blue fly, fig. 86. here exhibited, is not 
without its peculiar ornaments; it grows out of the 
middle part of the body of the fly, and is feated a 
little beyond the center of gravity thereof, towards 
the head ; but that ii curioufly ballanced by the ex- 
