Cerebrology in Phrenology. 615 
Rolando as a means of estimating grades of intelligence in animals 
by the relative masses of brain parts it separated. Meynert! had, 
unknown to me, nearly simultaneously, stated that the angle at 
which the Rolandic departed from the Sylvian fissure was a meas- 
ure, but in this he is in error, for that angle is not constant for spe- 
cies, while the relative proportions of fore and rear brain divided 
by the Rolandic sulcus maintain a just ratio to grades of intelli- 
gence, and the left suleus summit should be farther back in the 
normal brain than the one upon the right side. I also claimed that 
the cerebellum was covered by the cerebrum in proportion as the 
frontal lobe developed and crowded the occipital portion backward, 
= forehead by this pressure is correspondingly expanded and 
ifted 
In the scale of higher intelligence the connecting commissures of 
the brain are more numerous, and the cortical gray matter is 
encroached upon by more cells and fibres. Convolutions are not 
necessarily more numerous, except where the cranium is relatively 
small and the soft brain tissue by rapid growth folds in to accom- 
modate itself to the want of corresponding skull growth. 
Á In accord with the results of earlier electrical experiments upon 
T brains of anthropoid apes, dogs and other animals, are 
e effects of disease limited to special parts of the brain of man, 
? Archiv für Psychiatrie, vii. 
