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 faqe 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. 



