The simplest and earliest of these in which men's powers, similar in kind and degree, are united in pursuit of a benefit which, when obtained, they all participate in, is most familiarly exemplified in the catching of game by primitive men: this simplest and earliest form of industrial co-operation being also that which is least differentiated from militant co-operation; for the co-operators are the same, and the processes, both destructive of life, are carried on in analogous ways. The condition under which such co-operation may be successfully carried on is that the co-operators shall share alike in the produce. Each thus being enabled to repay himself in food for the expended effort, and being further enabled to achieve other such desired ends as maintenance of family, obtains satisfaction: there is no aggression of one on another, and the co-operation is harmonious. Of course the divided produce can be but roughly proportioned to the several efforts joined in obtaining it, but there is actually among savages, as we see that for harmonious co-operation there must be, a recognition of the principle that efforts when combined shall severally bring equivalent benefits, as they would do if they were separate. Moreover, beyond the taking equal shares in return for labors that are approximately equal, there is generally an attempt at proportioning benefit to achievement, by assigning something extra, in the shape of the best part or the trophy, to the actual slayer of the game. And obviously, if there is a wide departure from this system of sharing benefits when there has been a sharing of efforts, the co-operation will cease. Individual hunters will prefer to do the best they can for themselves separately.