THE PSYCHIC DEVELOPMENT OF YOUNG ANIMALS 24] 
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. 
IT 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. 
Q 
