274 ANIMAL INTELLIGENCE 



the 12th day, and the movements in which the head 

 and face parts are concerned can be induced by 

 electrical stimulation about this time. It is to be 

 specially noted that these movements can be produced 

 in the rabbit, experimentally, almost as soon as those of 

 the fore-limb in fact, I question whether, in some 

 cases at least, they are not excitable earlier and with 

 greater facility, i.e. with a weaker current. With the 

 hind-legs the case is altogether different in fact, my 

 investigations would lead me to infer that the hind-legs 

 are never related to the cortex in the same way as the 

 fore-limbs. In no case have I been able to establish 

 to my satisfaction the existence of a cortical centre for 

 the hind-legs of the same nature (to put the matter 

 cautiously) as those for the fore-limbs, head, face, etc. 

 The relation between the early, and all but simultaneous, 

 development of the cortical centre for the fore-limbs 

 and head (and face) parts, and the physiological and 

 psychic manifestations of the young rabbit afford one 

 of the most beautiful and striking illustrations of cor- 

 relation known to me. 



IV. -THE CAVY, OR GUINEA-PIG. 



THE cavy comes into the world able to take care of 

 itself. It can, in a few hours, if not at once, run about 

 quite well, eat, etc. It is at the set-out as far on in the 

 path of development as a rabbit some days after its 

 eyes are open, though in the end there is little difference 

 between these two rodents physically or otherwise. 



Corresponding with this advanced physiological and 

 psychic development, the cortex is, as I have shown, 

 excitable at or soon after birth, so that here again there 

 is rendered evident by experiment a close correlation 

 of the kind considered throughout this paper. 



