206 ANIMAL INTELLIGENCE 



brought about through stimulation of the skin ; of the 

 existence of the ability to distinguish hot and cold 

 objects, and of capacity to suffer pain; though, as 

 regards all these, the latent period is relatively very 

 long. At birth, and up to the 3rd day, though it is 

 likely that all these powers exist in the animal, the 

 evidence is feeble. 



Motor power is restricted to such an extent that the 

 animal can crawl only and but slowly. 



Tactile sensibility, the sense of pain, and the tem- 

 perature sense reach their highest degree of develop- 

 ment earlier than hearing and vision. 



Hearing is established before seeing, and reaches its 

 greatest perfection sooner than vision. 



In the progress of all the senses to full development, 

 the course, while marked by definite steps, is often so 

 rapid that distinct advances may sometimes be noted 

 in a single day. 



Not only in the development of the senses, but in all 

 other phases of progress has this been clearly evident 

 in the case of the kitten under observation. 



Apart from the senses, etc., there seems to be a 

 definite order in which all the features of feline nature 

 appear, e.g. purring, crouching, stalking, etc. 



Certain physical changes are correlated in time with 

 certain psychic developments, the significance of which 

 is in some cases clear, in others obscure. 



III. THE MONGKEL DOG. 

 The Mongrel and the Pure- Bred Dog Compared. 



IN my first paper on the psychic development, etc. 

 of the Dog, the observations and conclusions applied 

 to pure -bred animals only, though two widely different 

 breeds were compared. 



