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It is also true that the physical form may easily change in the

course of generations through the mode of life; and the weakness

or delicacy, which was once a matter of opinion, may become a

physical fact. The characteristics of sex vary greatly in

different countries and ranks of society, and at different ages

in the same individuals. Plato may have been right in denying

that there was any ultimate difference in the sexes of man other

than that which exists in animals, because all other differences

may be conceived to disappear in other states of society, or

under different circumstances of life and training.