the rattlesnake, which he flees or slays without pause for thought—it seems nothing less than intuitive and involuntary loathing. The Seri antipathy is at once deepened into an obsession and crystallized into a cult; the highest virtue in their calendar is the shedding of alien blood; and their normal impulse on meeting an alien is to kill unless deterred by fear, to flee if the way is clear, and to fawn treacherously for better opportunity if neither natural course lies open. Concordantly with their primary characteristic, the Seri have avoided ethnic and demotic union beyond the narrow limits of their own kindred; and even of these they seem to have cast out parts, annihilating the Guayma and Upanguayma, displacing and nearly destroying the Tepoka, and outlawing individuals and (apparently) small groups. The earlier chronicles indicate that the Jesuit missionaries, and after them the Franciscan friars and the secular officials, sought to scatter the tribe by both cajolery and coercion, and endeavored to divide families by restraint of women and children and by banishment of wives; there are loose traditions, too, of the capture and enslavement of Indian and Caucasian women in Seriland; yet the great fact remains that not a single mixed-blood Seri is known to exist, and that no more than two of the blood (Kolusio and perhaps one other) now live voluntarily beyond the territorial and consanguineal confines of the tribe. The romantic story of a white slave and ancestress of a Seri clan, sometimes diffused through pernicious reportorial activity, is without shadow of proof or probability; the tradition of the captivity of a Papago belle was corroborated, albeit indefinitely, by Mashém’s naive admission that an alien women was once kept as a slave to a childless death due to her inaptitude for long wanderings; and there is not a single known fact indicating even so much as miscibility of the Seri blood with that of other varieties of the genus _Homo_. Naturally the presumption of miscibility holds in the absence of direct evidence; yet the presumption is at least partially countervailed by conspicuous biotic characters, such as color, stature, etc., so distinctive as almost to seem specific: the Seri are distinctively dark-skinned, their extreme color-range (so far as known) being less than their nearest approach to any neighboring tribe; they are nearly as distinctive in stature, the difference between their tallest and shortest normal adults being apparently less than that between their shortest and the tallest of the neighboring Papago—though they are not so far from the more variable and often tall Yaqui; and they appear to be no less distinctive in such physiologic processes as those connected with their extraordinary food habits. Still more distinctive are the demotic characters connected with their habits of life and modes of thought; and when the sum of biotic and demotic characters is taken, the Seri are found to be set