Hence, if in the following pages, in the array of minute facts incident to the successive peoples of which we speak, some of them appear small and unworthy of notice, let it be remembered that in nature there is no such thing as insignificance; still less is there anything connected with man unworthy of our most careful study, or any peculiarity of savagism irrelevant to civilization. [Sidenote: ORIGIN OF MAN.] Different schools of naturalists maintain widely different opinions regarding the origin of mankind. Existing theories may be broadly divided into three categories; in the first two of which man is considered as a special creation, and in the third as a natural development from some lower type. The special-creation school is divided on the question of unity or diversity of race. The first party holds by the time-honored tradition, that all the nations of the earth are descended from a single human pair; the second affirms, that by one creative act were produced several special creations, each separate creation being the origin of a race, and each race primordially adapted to that part of the globe which it now inhabits. The third theory, that of the development school, denies that there ever were common centres of origin in organic creation; but claims that plants and animals generate spontaneously, and that man is but the modification of some preexisting animal form. [Sidenote: HYPOTHESES CONCERNING ORIGIN.] The first hypothesis, the doctrine of the monogenists, is ably supported by Latham, Prichard, and many other eminent ethnologists of Europe, and is the favorite opinion of orthodox thinkers throughout Christendom. The human race, they say, having sprung from a single pair, constitutes but one stock, though subject to various modifications. Anatomically, there is no difference between a Negro and a European. The color of the skin, the texture of the hair, the convolutions of the brain, and all other peculiarities, may be attributed to heat, moisture, and food. Man, though capable of subduing the world to himself, and of making his home under climates and circumstances the most diverse, is none the less a child of nature, acted upon and molded by those conditions which he attempts to govern. Climate, periodicities of nature, material surroundings, habits of thought and modes of life, acting through a long series of ages, exercise a powerful influence upon the human physical organization; and yet man is perfectly created for any sphere in which he may dwell; and is governed in his condition by choice rather than by coercion. Articulate language, which forms the great line of demarcation between the human and the brute creation, may be traced in its leading characteristics to one common source. The differences between the races of men are not specific differences. The greater part of the flora and fauna of America, those of the circumpolar regions excepted, are