218 ROYAL SOCIETY OF CANADA 
mucous membrane, is well illustrated by the observations recorded at 
different times in the early life period of the puppies. 
Both smell and taste are very feebly developed before the oyes are 
open, but about the 10th day there was clear evidence of both enjoyment 
and disgust through taste at all events. 
The general advancement of the animal is well shown in its 
behaviour towards blistering fluid on the 10th day. 
By the 20th day smell had become a powerful moving force in the 
animal as it always will continue to be. 
The manner in which a sleeping dog, young or old, is affected by the 
presence of food with a pronounced smell is very impressive to one who 
witnesses it. 
At so early a period as the 24th day this puppy’s sense of smell was 
80 well developed, it will be noticed that he followed a bone by its aid 
quite well. At this period he used his eyes as well as his nose to guide 
him. 
At this date also hearing was good; in fact by the 25th day the 
dog had reached a period of fair development of all his senses and with 
considerable motor power which of course also implies a corresponding 
development of the muscular sense. Hearing seems to be the most 
rapidly developed of all the senses 7.e. the period from its first beginnings 
to its greatest acuteness is relatively short. 
The pleasure of the puppy on having its head stroked on the 31st 
day is noteworthy. 
The Mongrel Dog and the Pure-Bred Dog Compared. 
In my first paper on the Dog (Trans. Roy. Soc. Can., 1894) certain 
differences were noted between two varieties of pure-bred dogs—the one 
large and the other small, viz., between the St. Bernard and the Bedling- 
ton terrier. I now propose to compare the pure-bred and the mongrel 
chiefly on the basis of my records in the earlier and in this paper. 
The mongrel showed more vigour at birth and shortly after as evi- 
denced to me at a distance by the voice. He also seemed to be somewhat 
less influenced by cold, though more persistent or at least more successful 
in getting all the heat possible from the dam. 
Although this is not specially noted in the diary the mongrel did not 
show fatigue quite as soon as the pure-bred dog. 
The eyes began to open earlier than in either the St. Bernard or the 
Bedlington. I could not get certain evidence of smell in the case of the 
St. Bernard before about the 12th or 13th day, but in the mongrel there 
is some evidence of smell on the 10th day at latest. The Bedlington 
smelled meat on the 10th day. I am not prepared to state that dogs do 
not smell at all before the 10th day or even the 5th day for which there 
