IN GENERAL. 113 
larity is so very great, the general structure of the 
animals cannot depart from this leading and chief 
organ of the whole. The principal, it will be ob- 
served, is detected in the relative development of 
the cranial chamber that holds the brain, for, in 
proportion to this increase of size, the instinctive 
and intellectual faculties are found to be augmented. 
In one group of domestic dogs, however, there is 
one bearing evidence of a much greater departure 
from the general similarity,—a departure leading to 
a strong presumption that the typical animal was 
taken from an aberrant species,—one more nearly 
approximating the hyzena, and allied to Canis tricolor 
or pictus of authors. The group is that of the mas- 
tiff and our bulldog, whose structure will be exa- 
mined in the sequel. 
We invite the attention to the difference in the 
frontal line of the profiles, the relative position of 
the orbits, and the strength of the great carnassier 
molar, and it will be observed that the great Canada 
wolf (if it be a wolf?) is possessed of a greater 
development of the brain, less space for attaching 
the muscles of the neck and jaws, a more plain 
profile, and forms in general approximating the 
dingo; and therefore we think the head belongs, 
not to a true wolf, but to one of our group Lyciscus. 
In the dingo, Canis Australie, of our arrangement 
Chryseus Australie, we see the cerebral chamber 
not greatly enlarged, the molars of middle propor- 
tion, the incisor teeth nearly in a straight line, dif- 
fermg from the jackal where they form a semicircle, 
VOL. I. W 
