“It is a well recognized fact in the history of science that the very subjects which concern our dearest interests, which lie nearest our hearts, are exactly those which are the last to submit to scientific methods, to be reduced to scientific law. Thus it has come to pass that while babies are born and grow up in every household, and while the gradual unfolding of their faculties has been watched with the keenest interest and intensest joy by intelligent and even scientific fathers and mothers from time immemorial, yet very little has yet been done in the scientific study of this most important of all possible subjects--the ontogenetic evolution of the faculties of the human mind. “Only in…
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