THE PSYCHIC DEVELOPMENT OF YOUNG ANIMALS 145 



23rd day. Playing. Differences in coat, shape of head, 

 etc., showing a physical advance. 



They now bite and chew at objects. They show a decided 

 aversion to Epsom salts. 



25th day. Began feeding milk. They do fairly well at 

 first attempt to lap. 



2Qth day. They push through some slats confining them, 

 showing considerable co-ordinative power, etc. 



30th day. Kepeated and rapid pinching of their sides 

 makes them very angry snarl, etc. 



The fall of a shovel causes them all to cower with fear. 



32nd day. Lip-call followed by their approach with 

 wagging tail. 



37th day. The sound of a whip surprises and seems to 

 puzzle them. 



&5th day. When about to punish another mature terrier 

 they hide away under the benches. 



They are put down in the yard, a large one, for the first 

 time, and seem puzzled and shy. 



4:6th day. Great changes now visible in physical features, 

 expression of face (more knowing), etc. They now crowd 

 each other when eating from the same dish. Their move- 

 ments and whole demeanour more terrier-like. This is seen 

 in play very clearly. 



They are now much more readily and profoundly affected 

 by noises. 



tfth day. Eapid development owing to enlarged ex- 

 perience ; much more aggressive. 



50th day. Two of them given bones. Each goes off with 

 one. When one comes up to take the other's, he pulls it 

 away but does not growl. Lies down to bone and uses his 

 feet to steady it like a mature dog. When the bone is 

 snatched up the puppy sniffs about after it. 



Sexual and individual differences now more evident I 

 mean that the peculiarities of shape, expression, and 

 demeanour that characterise a mature bitch, and which only 

 close observers of dogs detect, are now fairly well developed. 



58th day. When looking out into darkness at night they 

 show hesitation, fear^ etc. 



The discussion that follows is based almost entirely 

 on the diary of the litter of St Bernard puppies, ex- 

 tended over sixty days. 



K 



