ANIMAL REPRODUCTIONS. 295 
‘large horns to avoid the fubftances almoft in 
* contaét with them. And what further added 
*to my doubt was never being able, with the 
* bright light of a candle, or concentrated rays of 
“a lens, to make the horns alter their direction, 
‘unlefs when forced to retra&t by too intenfe 
* heat. Although, by approximating a luminous or 
* opaque body, they have afforded fome fymptom 
‘ of vifion, repeated experiments, which are ad- 
* verfe to it, have confirmed my doubts, or at leaft 
© made me fufpeét, if thefe do fee, that their fight 
*is exceflively obfcure and indiftiné. But as 
‘their defect is very great in this, fo are they 
* moft fenfible in touch. Thus, when naturally 
© {tretched out, the horns are carried well extend- 
© ed before them, that they may be warned of the 
* flighteft obftacle, juft as a blind man is warn- 
© ed by his ftaff to deviate from obftructions in 
‘his way. It is fufficient to behold {nails advan- 
*cing to be convinced of this. They feel or 
“ grope along ; no fubftance oppofed {tops their 
* progrefs, but the horns unexpectedly ftrike 
“again{t it, and then are fuddenly retracted: 
“Next, being extended anew, they feem, by 
* touching and retouching, to renew the exami- 
‘nation; and, afluming the touch as the rule of 
© direction after confidering the obftacle, deter- 
* mine whether to deviate from their route, if it is 
€ great, or to continue if it is inconfiderable.. If 
s% A © the 
