236 ROYAL SOCIETY OF CANADA 
15th day.—Their mode of progression is more like that of the mature 
rabbit, 7.e., loping rather than walking, in the ordinary sense of the word. 
17th day.—They are seen not only to lick and scratch, but to bite. 
18th day.— Begin to poke into corners now when placed on the floor. 
19th day.—There is no doubt that they now see. 
20th day.—One now begins to show the dark markings on tail, ears and 
nose, characteristic of the breed. 
They now scratch hard at the wood of their box at times. 
21st day.—They eat oats. , 
25th day.—A fair pad of hair has developed on the foot. 
They are now put down with the members of the other litter, twenty- 
two days older, and act very much as they do. 
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, ete. 
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 seventeen 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. 
Tam 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, eg., 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. 
A couple of them are put into a box 18x8 inches in which there is 
some salt, some brown sugar, some * peppermint rock” candy and some 
camphor. 
