Without touching yet upon the influence of the social factors, treating the human being merely as an individual animal, we see that he is modified most by his economic conditions, as is every other animal. Differ as they may in color and size, in strength and speed, in minor adaptation to minor conditions, all animals that live on grass have distinctive traits in common, and all animals that eat flesh have distinctive traits in common,—so distinctive and so common that it is by teeth, by nutritive apparatus in general, that they are classified, rather than by means of defence or locomotion. The food supply of the animal is the largest passive factor in his development; the processes by which he obtains his food supply, the largest active factor in his development. It is these activities, the incessant repetition of the exertions by which he is fed, which most modify his structure and develope his functions. The sheep, the cow, the deer, differ in their adaptation to the weather, their locomotive ability, their means of defence; but they agree in main characteristics, because of their common method of nutrition. The human animal is no exception to this rule. Climate affects him, weather affects him, enemies affect him; but most of all he is affected, like every other living creature, by what he does for his living. Under all the influence of his later and wider life, all the reactive effect of social institutions, the individual is still inexorably modified by his means of livelihood: “the hand of the dyer is subdued to what he works in.” As one clear, world-known instance of the effect of economic conditions upon the human creature, note the marked race-modification of the Hebrew people under the enforced restrictions of the last two thousand years. Here is a people rising to national prominence, first as a pastoral, and then as an agricultural nation; only partially commercial through race affinity with the Phœnicians, the pioneer traders of the world. Under the social power of a united Christendom—united at least in this most unchristian deed—the Jew was forced to get his livelihood by commercial methods solely. Many effects can be traced in him to the fierce pressure of the social conditions to which he was subjected: the intense family devotion of a people who had no country, no king, no room for joy and pride except the family; the reduced size and tremendous vitality and endurance of the pitilessly selected survivors of the Ghetto; the repeated bursts of erratic genius from the human spirit so inhumanly restrained. But more patent still is the effect of the economic conditions,—the artificial development of a race of traders and dealers in money, from the lowest pawnbroker to the house of Rothschild; a special kind of people, bred of the economic environment in which they were compelled to live.