THE PSYCHIC DEVELOPMENT OF YOUNG ANIMALS 241 



28th day. Their hair has grown about as long as 

 that of their parents. 



The Cavy, or Guinea-Pig. 



The following notes were made on a litter of common 

 cavies, and will serve to mark the contrast between this 

 rodent and the rabbit in the rate of development, etc. 



Diary. 



The cavies were born between 2 P.M. and 5.30 P.M. in 

 July, and were tested at 9 A.M. say, after about seven- 

 teen hours. 



Not only are the eyes open, but they see well, and 

 when the finger is moved before the eyes the winking 

 reflex follows. 



Some of them are placed on my study table, and run 

 so fast they almost get off the table before being caught. 



The ears are well opened up, and when I whistle 

 moderately they again run almost off the table. 



I find it more difficult to demonstrate whether they 

 smell or not than in the case of the rabbit. 



When volatile, pungent liquids, like blistering fluids. 

 are placed near, the eyes seem to close, and the same 

 happens with aloes. 



Like rabbits, they are born with teeth (in front), and 

 this makes it not very easy to get things into the mouth 

 to test taste. 



I am quite unable to decide whether they taste or not. 



They are tested again at 11 A.M. the same day. 



Pungent, volatile liquids, such as used with the 

 rabbit, and aloes do not seem to affect them so much as 

 the rabbits, e.g. no sneezing is produced. 



When a feather, dipped in a solution of sugar, is 

 placed in the mouth it is sucked, but they turn away 

 from similar treatment with aloes. 



