xvr 
afterted to be fufceptibie of the lead motion of the 
air ; one of our lateft writers on infefts fays; u We 
muff conclude that the antennse of infe&s are appro¬ 
priated for fome other purpofes than thofe it is at 
prefent fufpe&ed they anfwer. The organs of hearing 
in the crab and lobfler have been difcovered and 
figures of them published : the external orifice of the 
organ in thefe animals is placed between the long and 
the fhort antennae ;■ the cochlea, &c. being lodged in 
the upper part, which Linnaeus calls the thorax, near 
the ferrated projection at its apex. ,? 
* 
EYES . 
The eyes are covered with a tranfparent, crufta- 
ceous fet of lenfes, to prote£! them, being a lumi¬ 
nous coat of mail. 
Many infers have two crefcents or immoveable 
caps ; compofing the greatefh part of their head ; and 
containing a prodigious number of little hemifpheres 
or 'round protuberances ; placed with the utmoft re¬ 
gularity and exaCtnefs, in lines croffing each other 
and relembling- lattice work : thefe are a collection 
of eyes* 
One may fee the figure of a candle multiplied almoft 
to infinity on their furfaces ; fhifting its beams into 
each eye according to the motion given it by the 
obferver's hand ; and as other creatures are obliged to 
turn their eyes to objefts, this fort have always mine 
b 2. or 
