be observed that this ultimate unit is a group and not an individual. Every individual excludes every other in the competition of life unless they can by combining together win more out of nature by joint effort than the sum of what they could win separately. This combination is what makes groups and brings about industrial organization. When a man and woman unite in the most elementary group known, they do it for economic reasons, because they can carry on the struggle for existence better together than apart. In time this turns into a kin-group, united "by blood." This remains undivided as long as its organization gives advantages, but breaks up when it grows too big for the existing economic system. As soon as it breaks, the fractions begin to compete with each other. If by greater culture a higher organization becomes possible, two groups coalesce by intermarriage or conquest, competition gives way to combination again, and the bigger unit enters into competition with other composite units. Thus at all stages throughout the history of civilization competition and combination forever alternate with each other.
These groups are independent of each other, their size being determined by their mode of life, because the number who can live together economically is limited by the possibilities of the food-quest. When a group outgrows this limit, it breaks up and scatters. The fact of former association is long remembered and there is a bond of kinship and alliance which may at times draw former associates together again for festivals and religious observances, but after they separate the tendency is to become entirely independent and to fall under the type just described; viz., scattered groups each with its individuality, yet in a certain neighborhood to each other. Their remoter relationship does not keep them from quarreling
