488 
DR. D. EERRIER ON THE BRAIN OF MONKEYS. 
(9) Destruction of the occipital lobes produces no effect on the special senses, nor on 
the powers of voluntary motion, but is followed by a state of depression and refusal of 
food not to be accounted for by mere constitutional disturbance consequent on the 
operation. The function of these lobes is regarded as obscure, but considered as being 
in some way related to the systemic sensations. Their destruction does not abolish the 
sexual appetite. 
(10) After removal both of the frontal and occipital lobes an animal still retains its 
faculties of special sense and the powers of voluntary motion. 
