It may be pointed out finally that the field of spontaneous action is relatively increased with the endless multiplications of action accompanying the passage from the lower realms to the higher—indeed the relations may be likened unto those of exogenous growth, which is largely withdrawn from the irresponsive and stable interior structures and gathered into the responsive and spontaneously active peripheral structures; so that spontaneous activity attending natural development is relatively more important in the higher stages than in the lower.[266] [266] The laws of growth recognized herein have been somewhat more fully outlined elsewhere, notably in The Earth the Home of Man (Anthropological Society of Washington, Special Papers 2, 1894, pp. 3-8), and in Piratical Acculturation (American Anthropologist, vol. XI, 1898, pp. 243-249). Now, on combining the several indications it is found clear (1) that the more spontaneous developmental factor in all normal growth corresponds with the esthetic factor in demotic activity; (2) that this is the initiatory factor and the chief determinant of the rate and course of development; (3) that it is of relatively enlarged prominence in the higher stages; and hence (4) that the esthetic activities afford a means of measuring developmental status or the relative positions in terms of development of races and tribes. * * * * * On applying these principles to the Seri tribe, in the light of their meager industrial motives and still poorer esthetic motives, it would appear that they stand well at the bottom of the scale in demotic development. Their somatic characteristics are suggestively primitive, as already shown; and the testimony of these characteristics is fully corroborated by that of their esthetic status as interpreted in the light of the laws of growth. INDUSTRIES AND INDUSTRIAL PRODUCTS The pacific vocations of the Seri are few. They are totally without agriculture, and even devoid of agricultural sense, though they consume certain fruits and seeds in season; they are without domestic animals, though they live in cotoleration with half-wild dogs, and perhaps with pelicans; and they are without commerce, save that primitive and inimical interchange commonly classed as pillage and robbery. Accordingly, their pacific industries are limited to those connected with (1) sustentation, chiefly by means of fishing and the chase; (2) navigation and carrying, (3) house-building, (4) appareling, and (5) manufacturing their simple implements and utensils; and these constructive industries are balanced and conditioned by the destructive avocation of (6) nearly continuous warfare. FOOD AND FOOD-GETTING