or Horns of Infedls. 231 
performing that Office with their Fore-legs, 
it is certain their Horns muff be intended for 
fome other Purpofe. And fince they are 
perpetually feeling before them with their 
Antenna as they walk along, *Mr. Derham 
very realonably imagines them abfohttely 
neceffary to fearch and find out their Way. 
For as their Eyes are immoveable, fo that 
no Time is required for their turning them 
to Objedts, there is no Neceffity that the 
'Retina, or Optic Nerve, fhould occafionally 
be brought nearer to, or removed farther 
from the Cornea, as it is in other Animals % 
which would require Time: but their Cornea 
and Optic Nerve being always at one and 
the fame Diftance, and fitted only to fee 
diftant Objedts ; they would be infenfible 
of, and apt to run their Heads againft Bodies 
very near them, were they not affifled by 
their Feelers . 
And that this, rather than wiping the* 
, Eyes, is the ehief Ufe of the Feelers, is far¬ 
ther manifeft from th q Antenna of the Flejh - 
Fly, and many other Infedts, which are 
fhort and ffcrait, and uncapable of being bent 
down to, or extended over the Eyes : as alfo 
from others enoraioufiy long, fuch as thofe 
of the Capricorni or Goat Chafers, the 
Cadew Fly, and divers others both Beetles 
and Flies. ■ . .. • , 
# Derkam’s Phypca-Tfitcltf. 365. 
The 
