All these things presuppose the development of pacific forms of intercourse between neighboring groups. These forms are to be found almost universally. They could very easily be developed at this period, since the discovery had not yet been made that men can be utilized as labor motors. At this stage, the stranger is treated as an enemy only in doubtful cases. If he comes with apparently peaceable intent, he is treated as a friend. Therefore, a whole code of public law ceremonies grew up, intended to demonstrate the pacific intent of the newcomer.[K] One puts aside one’s arms and shows one’s unarmed hand, or one sends heralds in advance, who are always inviolable. [K] In this category must be reckoned the salutation, still in use in some parts, “Peace Be With You.” It is expressive of the perversity of Tolstoi’s later years that he misapprehends this characteristic mark of a time when war was the normal state of affairs, as the remnant of a golden age of peace. _The Importance of the Russian Revolution_ (German translation by A. Hess, p. 17). It is clear that these forms represent some kind of claim to hospitality, and in fact it is by this guest-right that peaceful trade is first made possible. The exchange of guest-gifts precedes, and appears to introduce, barter proper. It becomes, therefore, important to investigate the source of hospitality. Westermarck, in his recent monumental work (1907), _Origin and Development of Moral Concepts_,[68] states that the custom of hospitality results from two causes, curiosity for news from the stranger from afar, and still more from the fear that the stranger may be endowed with powers of sorcery, imputed to him just because he is a stranger.[L] In the Bible, hospitality is recommended for the reason that one can not know that the stranger may not be an angel. The superstitious race fears his curse (the Erinys of the Greeks) and hastens to propitiate the stranger. Having been accepted as a guest he is inviolable and enjoys the sacred right of the blood-related group, and is regarded as belonging to it during his stay. Therefore he partakes of the benefits of the aboriginal communism reigning in the group, and shares its property. The host demands and receives whatever he claims, the stranger obtains in turn what he asks for. When the peaceable intercourse becomes more frequent, the mutual giving of guest-presents may develop into a trading arrangement, because the trader gladly returns to the spot where he found good entertainment and a profitable exchange and where he is protected by the laws of hospitality, instead of seeking new places, where, often with danger to his life, he would first have to acquire the right to hospitality.