Morgan himself was evidently deeply impressed by the function of the classificatory system of relationship as a body of salutations. His own experience was derived from the North American Indians, and he notes the exclusive use of terms of relationship in address, a usage so habitual that an omission to recognise a relative in this manner would amount almost to an affront. Morgan also points out, as one motive for the custom, the presence of a reluctance to utter personal names. McLennan had to rely entirely on the evidence collected by Morgan, and there can be no doubt that he was greatly influenced by the stress Morgan himself laid on the function of the classificatory terms as mutual salutations. That in rude societies certain relatives have social functions definitely assigned to them by custom was known in Morgan’s time, and I think it might even then have been discovered that the relationships which carried these functions were of the classificatory kind. It is, however, only by more recent work, beginning with that of Howitt, of Spencer and Gillen, and of Roth in Australia, and of the Cambridge Expedition to Torres Straits, that the great importance of the functions of relatives through the classificatory system has been forced upon the attention of sociologists. The social and ceremonial proceedings of the Australian aborigines abound in features in which special functions are performed by such relatives as the elder brother or the brother of the mother, while in Torres Straits I was able to record large groups of duties, privileges and restrictions associated with different classificatory relationships. Further work has shown that widely, though not universally, the nomenclature of the classificatory system carries with it a number of clearly defined social practices. One who applies a given term of relationship to another person has to behave towards that person in certain definite ways. He has to perform certain duties towards him, and enjoys certain privileges, and is subject to certain restrictions in his conduct in relation to him. These duties, privileges and restrictions vary greatly in number among different peoples, but wherever they exist, I know of no exception to their importance and to the regard in which they are held by all members of the community. You doubtless know of many examples of such functions associated with relationship, and I need give only one example.