Of Flies. 67 
The fame, or one much like this is found on the tips 
©F oak and holly leaves. 
The horfe-fly is alfo a curious objedt; its eye is in the 
form of other flies, but is as it were indented all over 
with a pure emerald green, its body like filver in froft- 
work h , fringed all over with white filk. If the head of 
this fly be cut off juft at the fetting on of the neck, a 
pulling particle may be feen beating through the Ikin for 
half an hour together. 
The trunk or probolcis of a butterfly* which lies wound 
tip like an helix or fpiral fpring, gradually growing (lender 
as at fig. 113, fupplies the office both of mouth and 
tongue* it may with a pin be eafily drawn out to its full 
length, if it be cut off and laid upon the objedt carry¬ 
ing glafs* and fo applied to the microfcope you will 
fee it wind and coil^* itfelf up, and then to open 
itfelf again for a long time together, nature having made 
it of a fufficient length, that when extended it may reach 
into the hollows of flowers, and from thence extradt their 
dews and juices. It conftfts of two tubes near its ex¬ 
tremity* as reprefeiited at AC, fig. 113. the cavities of 
which unite at D, and from thence to the throat of the 
butterfly form but one channel k . Thefe tubular extre¬ 
mities are unfolded in the manner expreffed at B T N, 
fig. 114. in order to extract the dews, &c. from flowers; 
after which it is immediately drawn back and coiled up 
into an helix. M M, fig. 115. reprefents one of the ex¬ 
treme parts viewed with a greater magnifier, and deline¬ 
ated exactly in the manner as it is applied to leaves and 
flowers. Whence it appears, that it is not the extreme 
cad of the probofcis, which extracts the dews and juices; 
F 2 but 
h Power’s Micro. Obf. p. 7. * Ibid, p 8. k Micro, 
de Bonan. Pars 2. p. 48. 
