2292 ROYAL SOCIETY OF CANADA 
not in all cases more rapidly than the smaller breeds of terriers. While 
all pure-bred dogs must have a definite rate of development according to 
the breed, it must be plain that mongrels will vary much more individ- 
ually according to the nature of the ancestors which have contributed to 
their highly composite origin in many instances. In the very nature of 
the case the pure-bred dog is an inbred animal, while the mongrel is 
generally the very reverse. He in fact approaches far more closely to 
the wild Canidæ in this respect. 
From this it would be expected that the physical changes would be 
of a kind that would appeal to the eye much less—would be in fact less 
readily referred to any type or pattern; and in no small degree is this 
true of his psychic characteristics, though these things are much more 
readily observed than made clear by any records. 
