THE PSYCHIC DEVELOPMENT OF YOUNG ANIMALS 137 



kennel with three partitions or walls between (doors 

 being open) causes one of them, though lying apparently 

 asleep, to get up, and if anything happens they all 

 awake if one moves much or whines. 



One of them is observed to snap at a fly. 



At 10 P.M. I notice one of the puppies scraping away 

 the sawdust near the elevation referred to above, on 

 which he had laid his head in preparing to rest. He 

 tried the spot once or twice before he finally laid his 

 head down. 



42nd day. It is very warm, and the puppies whine 

 and cry a good deal owing to the discomfort, as their 

 coats are thick and warm. 



Now there are many evidences that they hear as 

 acutely as mature dogs, if not more so, and sounds dis- 

 turb them more, as they do not know their meaning 

 so well. 



They now show an interest in everything that goes 

 on within their field of examination with eyes, nose, etc. 

 In fact it is difficult to move about among them. 



When they see one they may cry out if hungry, wag 

 the tail if recently fed and satisfied, sniff, etc. 



This sniffing is a characteristic method of investigation 

 with dogs, and its appearance, at this date and earliei , is 

 significant. 



On every occasion, if they see or smell the dam (that 

 is seldom with them now, as they were gradually weaned 

 the process ending to-day), they cry out. 



While this litter is an unusually even one in physical 

 characteristics, at all events, individual differences are 

 to be observed in many directions. There are some 

 decided differences in psychic manifestations. 



One, a bitch, seems to be quicker and more precocious 

 than the rest by a great deal. 



One dog growls when feeding, as they do at present 

 all together from one large dish. 



