[12] Mathew, _J.R.S.N.S.W._, xxiii. p. 404, quoted from Westermarck, _H.H.M._, p. 57. Again E. Grosse in his well-known book, speaking of Howitt's work on the Kurnai says that this author "... hat sich so gründlich in seine Hypothese einer Gruppenehe ... der prähistorischen Australier vertieft, dass er darüber ganz vergisst, seine Leser darauf aufmerksam zu machen, dass die historischen Australier in Einzelnehe leben."[13] This is quite true, especially the remark that one of the chief sources of error in sociology is speculating on the origins and prehistory of an institution before this institution is thoroughly known in the present state. [13] E. Grosse, p. 6. And it seems as if in the present case a good many of the difficulties may be solved by understanding some of the statements made as referring to hypothetical earlier stages. As a matter of fact the passage quoted above, where the existence of group relationship is affirmed, is continued thus: "The idea of the relation of individual to individual, and of individual parentage, without reference to the group, is of later origin, and is the result of a number of social forces acting in the same general direction and producing change."[14] It is evident therefore that group relationship is supposed by Howitt to be the former state, and individual relationship a kind of innovation. But there is such a lack of clearness, such a confusion of the past and present tenses, that we are here again at a loss. Take for example the following passage: "The latest advance which has been made in the subject of Australian marriage was the conception of marriage in the group, and of group to group, and of the filial relation of one group to another."[15] This last phrase should be, in all probability, understood in the past tense, as referring to prehistoric times. But the author gives absolutely no hint whether this be so or otherwise. And when he on the next page refers to Mr. Curr's assertion, that there is actually no group relationship in Australia, and criticizes this assertion, a suspicion is aroused that this view of the existence of marital and filial groups is meant to express the actual status. This is enough to show how vague and puzzling the question of the individual family and individual relationship still is. [14] _Trans. R.S.V._, p. 135. [15] _Trans. R.S.V._, p. 113.