SECTION IV., 1895, [2238] Trans. R. S.C. 
X.—The Psychic Development of Young Animals and its Physical 
Correlation. 
By Weszey Mizis, MA. MD, F.R.S.C. 
Professor of Physiology in McGill University, Montreal. 
(Read May 16, 1895.) 
EN 
THE Doc AND THE Car COMPARED. 
Although, in popular estimation, the dog and the cat are considered 
as opposites in almost every respect, in reality they have much morein 
common than any two of those animals commoniy kept by man—as 
should be expected from their place in nature. 
À comparison will, however, prove profitable, it is believed, and this 
will be based chiefly on the diaries of the papers on “ The Dog” and “The 
Cat’? respectively. 
Both the dog and the cat, it is scarcely necessary to point out, are 
born blind and deaf, but the eyes of the eat open sooner than those of the 
dog, and hearing is also acquired somewhat earlier ; but in both the pro- 
cesses of learning to see and to hear are gradual ones. 
The papillary reflex is established sooner in the eat. 
So early as the 9th day, the kitten studied and previously reported 
on,’ turned its ears towards the direction of a sound. 
There is this difference, too, in the movement of the ears: the kitten. 
when re-acting to a sound, turns the ears or ear reflexly to the side 
rather, while the dog tends to draw them back. 
I have observed nothing in the young dog that corresponds to the 
quivering movements of the ears in the kitten, seen as early as the 9th 
day, and which possibly are imperfectly executed voluntary movements. 
like the trembling of the hand in old people. 
There is nothing in the dog that corresponds exactly to the hiss, or 
when feebler, the opening of the mouth in the kitten when surprised. 
So far as I know, this is sw/ generis among our domestic mammals, though 
there are analogies perhaps in birds, as in the hissing of geese or ducks, 
and the snapping of the beak in pigeons, even when very young, to which 
abundant reference has been made in my corresponding paper on birds.’ 

1 Trans. Roy. Soc. Can., 1894, Sec. 1V., p. 31; 1895, Sec. IV., p. 191. 
2 Trans. Roy. Soc., 1895, Sec. IV., p. 191. 
3 Trans. Roy. Soc., 1895, Sec. IV., p. 241. 
