Experts in Ethnology are earnest to recognize this other Unity on which I now insist. Our own Agassiz, who is the most illustrious of the masters not accepting the unity of origin, is careful to add, “that the moral question of Brotherhood among men” is not affected by this dissent; and he announces “that Unity is not only compatible with diversity of origin, but that it is the universal law of Nature.”[144] This other Unity found an eloquent representative in William von Humboldt, not less eminent as philologist than his brother as naturalist, who proclaims our Common Humanity to be the dominant idea of history, more and more extending its empire, “striving to remove the barriers which prejudice and limited views of every kind have erected amongst men, and to treat all mankind, without reference to religion, nation, or color, as one Fraternity, one great community”; and he concludes by announcing “the recognition of the bond of Humanity” as “one of the noblest leading principles in the history of mankind.”[145] And these grand words are adopted by Alexander von Humboldt,[146] so that the philologist and the naturalist unite in this cause. Thus in every direction do we find new testimony against the pretension of Caste. We are told that “a little learning is a dangerous thing.” If this be ever true, it cannot be better illustrated than by that sciolism which from the varieties of the human species would overthrow that sublime Unity which is the first law of Creation. As well overthrow Creation itself. There is no great intelligence which does not witness to this law. Bacon, Newton, Leibnitz, Descartes all testify. Laplace, from the heights of his knowledge, teaches that the curve described by a simple particle of air or vapor is regulated by a law as certain as the orbits of the planets; and is not Man the equal subject of certain law? God rejoices in Unity. It is with Him a universal law, applicable to all above and below, from the sun in the heavens to the soul of man. Not one law for one group of stars, and one law for one group of men,--but one law for all stars, and one law for all men. The saying of Plato, that “God geometrizes,”[147] is only another expression for the certainty and universality of this law. Aristotle follows Plato, when, borrowing an illustration from the well-known requirements of the Greek drama, he announces, that “in Nature nothing is unconnected or out of place, as in a bad tragedy.”[148] But Caste is unconnected and out of place. It is a perpetual discord, a prolonged jar,--contrary to the first principle of the Universe.