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, ¢.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. 
I11—TuHe Monerent Doe. 
The Mongrel and the Pure-Bred Dog Compared. 
In my first paper on the psychic development, ete. 
of the Dog, the observations and conclusions applied 
to pure-bred animals only, though two widely different 
breeds were compared. 
