AS APPLIED TO MAN. 855 
eat unclean food; and looks upon the marriage of 
adult females as gross immorality. 
The strength of the moral feeling will depend upon 
individual or racial constitution, and on education 
and habit;—the acts to which its sanctions are applied, 
will depend upon how far the simple feelings and affec- 
tions of our nature, have been modified by custom, 
by law, or by religion. 
It is difficult to conceive that such an intense and 
mystical feeling of right and wrong, (so intense as 
to overcome all ideas of personal advantage or utility), 
could have been developed out of accumulated ancestral 
experiences of utility; and still more difficult to under- 
stand, how feelings developed by one set of utilities, 
could be transferred to acts of which the utility was 
partial, imaginary, or altogether absent. But if a 
moral sense is an essential part of our nature, it is 
easy to see, that its sanction may often be given to 
acts which are useless or immoral; just as the natural 
appetite for drink, is perverted by the drunkard into 
the means of his destruction. 
Summary of the Argument as to the Insufficiency of 
Natural Selection to account for the Development of 
Man. 
Briefly to resume my argument—I have shown that 
the brain of the lowest savages, and, as far as we yet 
know, of the pre-historic races, is little inferior in size 
to that of the highest types of man, and immensely 
superior to that of the higher animals; while it is 
2a2 
