116 ANIMAL INTELLIGENCE 
My purpose may be stated about as follows :— 
(1) To give a detailed history of the psychic develop- 
ment up to a certain age of representatives of several 
animal groups. 
(2) To compare groups and individuals. 
(3) To correlate the psychical and physical—or, at 
all events, to make some attempt to connect, in time, 
the psychic and physical development. 
The completion of this work will even, so far as 
I am able to accomplish it, take a considerable time 
yet, so that I shall be obliged, in the present paper, 
to confine myself to one group of animals, viz. dogs, 
of which I have made a study during the greater part 
of my life, and more especially within the past ten 
years, as regards their psychic nature and certain other 
features. 
The present paper will be founded chiefly on the 
notes or diary of three litters of puppies—two of the 
St Bernard and one of the Bedlington terrier breed. 
These histories. then, will concern, it will be observed, 
only pure-bred dogs, as I have not as yet similar notes 
on mongrels. As the dog is, after the monkey, more 
like man psychically than any other animal, I hope 
to make some comparisons with the development of 
the young human being, though possibly not in this 
paper. 
Inasmuch as the diary of the last litter of St Bernard 
puppies studied is more complete, and was written in 
the light of my past experience, I regard it as much the 
most valuable. It will therefore be given first of all, as 
written day by day, with only a few verbal alterations, 
from which each reader may form his own independent 
conclusions. 
This I purpose to follow by certain remarks. As my 
work on the brain especially is not yet complete, the 
physical correlation which has to do chiefly, of course 
