276 ANIMAL INTELLIGENCE 
centres of the cortex of the cerebrum. The advance in 
movements, first of the limbs, and later of the head and 
face parts, together with the psychic progress associated 
with this, is correlated with the rapid development of 
the cortical centres for the limbs in the first instance, 
and later, for the head and face in the period im- 
mediately following the blind stage. 
This is more rapid and more pronounced in the cat 
than in the dog, and is correlated with the greater 
control in the cat over the fore-limbs and with certain 
physiological and psychic developments characteristic 
of the cat. 
Similar conclusions apply to the rabbit, except that 
the difference in the rapidity of development of head 
and face movements is correlated with an earlier 
organisation of the corresponding cortical centres, and 
that there is a greater difference between the fore-limb 
and the hind-limb, with all of which there are special 
psychic correlations bound up with certain peculiarities 
of the rabbit’s modes of life. 
The vast difference in physiological and psychic 
development of the cavy at birth is correlated with the 
presence of cortical cerebral centres, readily excited by 
artificial stimuli, centres which in a few days reach a 
practically perfect state of development. 
The psychic manifestations of the pigeon and the 
fowl have not the same sort of cerebral cortical 
correlates as the animals referred to above. 
