Secrion I V., 1895. [213 ] Trans. R.S. C. 
IX.—The Psychic development of Young Animals and its Physical Cor- 
relation. 
By Westey Mizzs, MA. MD. F.R.S.C. 
Professor of Physiology in MeGill University, Montreal. 
(Read May 16, 1895.) 
TE 
THE Moneret Doc. 
The Mongrel and the Pure-Bred Dog Compared. 
In my first paper on the psychic development, etc., of the Dog (Trans. 
Roy. Soc, Can., 1894), the observations and conclusions applied to pure- 
bred animals only, though two widely different breeds were compared. 
It seemed to me desirable for many reasons that the mongrel should 
also be studied, accordingly this paper will be devoted to that purpose 
and to a comparison between the mongrel and the pure-bred dog in a 
manner to harmonize with my general plan of treatment of the subject 
of psychogenesis in the lower animals. 
Diary. 
The puppies under observation belonged to a litter of 9, of which 7 
were preserved. The dam was a strong, healthy black animal and the 
sire was unknown. The dam and puppies were kept under similar con- 
ditions to those described in my first paper on the dog, 7. e., in a pen on 
the floor of a separate compartment of the kennel on which at first there 
was abundance of good straw and at a later date sawdust. The puppies 
were born in December and artificial heat was maintained in the kennel 
constantly so that the animals were always comfortable. The dam was 
well fed and otherwise properly cared for throughout, and from begin- 
ning to end was perfectly well and able to nurse her puppies in an 
entirely satisfactory manner. 
Ist day.—Vigour of puppies shown by a strong voice somewhat 
between a growl and a bark. 
They respond to a prick or punch and to a hot body but not so 
quickly. Oil of wormseed placed near the nose causes a sniffing; pure 
carbolic acid causes the face to be distorted ; blistering fluid leads to pro- 
trusion of the tongue, and tincture of iodine to sniffing. 
When soup is similarly placed before the nose there is no evidence of 
smell. 
