So various are the conditions of selfregulation in various animals, both in respect of their peculiar and several modes of assimilating different foods, and of protecting themselves against particular dangers from without, that, as we might have expected, the bloods taken from different species, or even perhaps from different individuals, are found to be so divergent that the healthy serum of one species may be, and often is, poisonous to another; not so much in respect of adventitious substances, as because the phases of physiological change in different species do not harmonize; each by its peculiar needs has been modified until, in their several conditions of life, they vary so much about the mean as to have become almost if not quite alien one to another.
According to the census of 1900 the population of Mexico numbered 13,607,259, of which less than one-fifth (19%) were classed as whites, 38% as Indians, and 43% as mixed bloods.
It is probable that the returns have never been accurate in regard to the mixed bloods and Indians, but it is the general conclusion that the Indians have been decreasing in number, while the mixed bloods have been increasing.
By the young bloods of the "House" he was treated pleasantly as a raw outsider of genius.
The white population is estimated at 100,000 to 120,000, which probably includes many of mixed ancestry, and the mixed bloods at 300,000 to 450,000.