interesting information on the many varieties of the colored races, produced by the crossing of Indians, negroes, and whites, which he has recorded not only in notes, but in a very complete series of photographs. Perhaps nowhere in the world can the blending of types among men be studied so fully as in the Amazons, where mamelucos, cafuzos, mulattoes, cabocos, negroes, and whites are mingled in a confusion that seems at first inextricable. I insert below a few extracts from his notes on this subject, which he purposes to treat more in detail, should he find time hereafter to work up the abundant material he has collected. “However naturalists may differ respecting the origin of species, there is at least one point on which they agree, namely, that the offspring from two so-called different species is a being intermediate between them, sharing the peculiar features of both parents, but resembling neither so closely as to be mistaken for a pure representative of the one or the other. I hold this fact to be of the utmost importance in estimating the value and meaning of the differences observed between the so-called human races. I leave aside the question of their probable origin, and even that of their number; for my purpose, it does not matter whether there are three, four, five, or twenty human races, and whether they originated independently from one another or not. The fact that they differ by constant permanent features is in itself sufficient to justify a comparison between the human races and animal species. We know that, among animals, when two individuals of different sex and belonging to distinct species produce an offspring, the latter does not closely resemble either parent, but shares the characteristics of both; and it seems to me of the highest significance that this fact is equally true of any two individuals of different sexes, belonging to different human races. The child born of negro and white parents is neither black nor white, but a mulatto; the child born of white and Indian parents is neither white nor Indian, but a mameluco; the child born of negro and Indian parents is neither a negro nor an Indian, but a cafuzo; and the cafuzo, mameluco, and mulatto share the peculiarities of both parents, just as the mule shares the characteristics of the horse and ass. With reference to their offspring, the races of men stand, then, to one another in the same relation as different species among animals; and the word _races_, in its present significance, needs only to be retained till the number of human species is definitely ascertained and their true characteristics fully understood. I am satisfied that, unless it can be shown that the differences between the Indian, negro and white races are unstable and transient, it is not in keeping with the facts to affirm a community of origin for all the varieties of the human family, nor in keeping with scientific principles to make a difference between