1890.] The Evolution of Mind. 1009 
oped language from inarticulate sounds and gestures, precisely as 
he has since developed new complexities expressive of the pro- 
gressive advance of his mental power. 
Mr. Romanes, in his work on the “ Origin of Human Faculty,” 
‘has been at great pains to examine and elucidate the question of 
the origin of the human intelligence, and I cannot do better than 
refer my readers to it as the best exposition of the subject in 
existence. 
The experiential theory adopted by Locke as a statement of 
the history of the human mind has been shown by Herbert Spen- 
cer to be more correctly an explanation of the development of 
the mind of animals in general, including that of man, On this 
hypothesis, while it is admitted that much may be acquired by each 
individual human mind by experience, it is asserted that more has 
been acquired by the race in general, and handed down to the 
existing generations by inheritance. It is further held that the 
elements of the mind of man were not acquired by him at all, 
but have been derived by him by inheritance from the preéxistent 
members of the animal kingdom from whom he is descended. 
It is the qualities which are thus inherited which appear to the 
student who is unacquainted with this explanation of their origin 
to be spontaneous, or “ intuitive” to the human mind. Thusthe 
so-called intuitions of man are shown to be the organized pro- 
ducts of the experience of preceding generations. The question 
of the origin by experience of the powers of thought of man is 
quite independent of the metaphysical question as to whether a 
given truth is contingent or necessary. The former may depend 
more directly on experience than the latter, but the capacity to 
apprehend the latter is as necessary a result of evolution as is 
the capacity to apprehend the former, if the evolution of the 
human mind be admitted. Of the truth of this mode of explana- 
_tion of the origin and growth of the latter there seems to the 
present writer to be no doubt. 
. As sensation appears to be present in some or all of the Pro- 
tozoa, without corresponding organs of sense, general or special, 
we believe that their protoplasm or part of it is endowed with a 
diffused conscious sensibility. Organs of a special sense, sup- 
hd 
