INSTINCT AND REASON. Di iy 
va 
‘we are not acquainted with that limit; and we may safely 
judge that such phenomenal manifestations as we distin- 
guish by the name of Genius are rendered possible by some 
unusually delicate adaptation of a specific region of the 
brain to the faculty with which it is correlative ; a pecularity, 
however, utterly beyond the power of the cerebral anatomist 
to detect. Such manifestations of Genius, which have 
brightened the history of our race, are due, on this view, to 
remarkable, and in a sense abnormal, subtlety of brain 
development, which renders possible a higher exercise of 
faculties, common indeed to all Mankind, but which in the 
generality are toned down by the exigencies of our material 
state and gross organisation. And thus we are led to the 
same point as before, viz., that when the time arrives that 
we shall cast off this material husk, there will be nothing to 
stand in the way of an indefinite expansion of our faculties, 
a vast exaltation of those with which we are familiar, and 
perhaps the birth of new ones which could never be adapted 
to the exigencies of a terrestrial and material life. 
Considering the immense importance of the functions of 
the brain, and the difficulty of satisfactory investigation into 
the living brain-structure, it would seem that the school of 
mental evolutionists are somewhat hasty in their estimate of 
the value of the special characteristics of the human brain. 
Mr. Romanes, at the outset of his work, feels bound to give 
prominence to the perplexing character of the relation of 
Intelligence to the size, mass, and weight of the brain in the 
animal kingdom as a whole. And indeed it does seem 
a serious difficulty when we bear in mind the minute size of 
the brain of animals which exhibit the wonderfully versatile 
and complex instincts of the ant or the bee. It is true that 
more bulky animals would seem to demand a brain more 
proportional to their size and weight; but still the difficulty 
remains that the ant, with its tiny ganglion, is capable of 
effecting combinations which would put to shame a mammal 
with a brain weighing as many pounds as the ant’s does 
grains. It would at all events suggest the belief that we 
are not fully acquaimted with the precise material co-efficient 
by means of which such operations are effected. 
“Now we really know (he adds) so little about the rela- 
tions of intelligence to netral structure, that I do not think 
we are justified in forming any very strong conclusion, 
a priori, concerning the relation of intelligence to mere size 
or mass of brain.” And again, “ Knowing in a general way 
that mass plus structure is necessary for intelligence, we do 
