174 ANIMAL INTELLIGENCE 
direction of development, and what manner of dog the 
individual becomes. It is education in the more 
limited sense. 
The order of development of the senses and co- 
ordinated movements as well as reflexes, and the mani- 
festation and perfecting of instincts, have a distinct 
relation to the needs, as well as the general develop- 
ment of the animal, eg. smell is always more impor- 
tant to the dog than any of his other senses, and it is 
early developed. The same remark applies to the 
movements of the jaws and the limbs over those of 
other parts. 
The detailed study of the development of the dog, as 
recorded in the foregoing pages, illustrates how depen- 
dent all subsequent advancement is on the early and 
full development of the senses and co-ordinated move- 
ments. They bring the nervous centres into contact, 
so to speak, with the environment. 
The same is illustrated in the study of the human 
infant; but in the case of the dog the investigation is 
not surrounded by the same complications or, at all 
events, prejudices. 
Although it is not possible as yet to determine the 
physical and psychic correlations down to the minutest 
details, from what has been accomplished, it seems 
reasonable to hope that a complete correlation may be 
ultimately established. 
The first sixty days of a dog’s existence are of so 
much more consequence than any later period, that the 
writer has decided to limit this paper to this period, 
within which almost all important features in develop- 
ment appear. 
