234 Of Wmgs of In feds. 
the Worlds whence he reflects very ingeni- 
oufly, on the Quicknefs of the Animal Spi« 
rits, that ferve to fupply this Motion. 
Thofe converfant in Micr of copes need not 
be informed, that the beautiful Colours on 
the Wings of Butterflies and Moths are ow¬ 
ing to elegant minute Feathers ending in 
Quills, and placed with great Exadtnefs in 
orderly Rows as, when rubbed off, the 
Holes they come from iliew : but few, it 
may be, have much ohferved the great Va¬ 
riety of their Make, not only in Moths and 
Butterflies of different Sorts, but even in 
thofe taken from different Parts of the fame 
Wing ; infomuch that it is pretty difficult 
to find any two of them exactly alike. 
Rub thefe Feathers gently off, with the 
End of your Finger or Pen-knife ; and, 
breathing upon a Angle Talc in one of your 
Sliders, apply It to the Feathers, which feem 
only like a fine Dull:, and they will imme¬ 
diately adhere to it: then placing it before 
the Micrcfcope, if they are not perfect, or 
lie not to your Mind, wipe them off, and put 
on others in the fame Manner, till you get 
thofe you like : then cover them with ano¬ 
ther Talc , and fallen it down with a Wire, 
that you may preferve them for future Ex¬ 
amination. Look at them with the third or 
fourth , then with the fecond, and at laftwith 
the greateji Magnifier, . 
