We can now easily account for that great difference which we observe in the intellectual powers of the sexes, dependent on habits of abstraction and generalization. Undoubtedly one of the greatest and most useful powers of the human mind, is that by which we are enabled to classify and generalize our ideas--that power which enables us, from the observance of multitudes of facts and details, to seize on those which possess a resemblance, to arrange them together under genera and species, and thus to arrive at general principles or facts applicable to thousands of cases which may occur in our passage through life. It is this power of abstraction and generalization which may be truly said to give to our reasoning faculties the wings of the eagle. We are enabled thereby to soar to a height, and command an extension of prospect which cannot be reached by those who do not cultivate this power. It is the great labor saving machinery in the economy of the human mind, and belongs in all its perfection only to a few gifted and educated minds, capable of rising to an altitude far, very far beyond the common intellectual level. According to the degree in which this noble faculty is possessed, the metaphysicians have made a division of the human race, very unequal as to numbers, into _men of general principles_ or _philosophers_, and _men of detail_. The former possessing minds inured to habits of abstraction and generalization, the latter more conversant with mere individuals and individual character, with the details and minutiæ of common life, and therefore better suited to the ordinary routine of every day duties in the common transactions of the world. But if I may borrow the sentiment of Mr. Burke, when the path is broken up, the high waters out, and the file affords no precedent, then men who possess minds of comprehension and generalization, are required to lead the way through the chaos of difficulties and dangers which surround them.