The features of terminology which follow from the cross-cousin marriage were known to Morgan, being present in three of the systems he recorded from Southern India and in the Fijian system collected for him by Mr. Fison. The earliest reference[9] to the cross-cousin marriage which I have been able to discover is among the Gonds of Central India. This marriage was recorded in 1870, which, though earlier than the appearance of Morgan’s book, was after it had been accepted for publication, so that I think we can be confident that Morgan was unacquainted with the form of marriage which would have explained the peculiar features of the Indian and Fijian systems. It is evident, however, that Morgan was so absorbed in his demonstration of the similarity of these systems to those of America that he paid but little, if any, attention to their peculiarities. He thus lost a great opportunity; if he had attended to these peculiarities and had seen their meaning, he might have predicted a form of marriage which would soon afterwards have been independently discovered. Such an example of successful prediction would have forced the social significance of the terminology of relationship upon the attention of students in such a way that we should have been spared much of the controversy which has so long obstructed progress in this branch of sociology. It must at the very least have acted as a stimulus to the collection of systems of relationship. It would hardly have been possible that now, more than forty years after the appearance of Morgan’s book, we are still in complete ignorance of the terminology of relationship of many peoples about whom volumes have been written. It would seem impossible, for instance, that our knowledge of Indian systems of relationship could have been what it is to-day. India would have been the country in which the success of Morgan’s prediction would first have shown itself, and such an event must have prevented the almost total neglect which the subject of relationship has suffered at the hands of students of Indian sociology. [9] Grant, _Gazetteer of Central Provinces_, Nagpur, 2nd ed., 1870, p. 276. LECTURE II In my last lecture I began the demonstration of the dependence of the classificatory terminology of relationship upon social institutions by showing how a number of terms used in several parts of Melanesia have been determined by the cross-cousin marriage. I showed that in places where the cross-cousin marriage is practised there are not merely one or two, but large groups of, terms of relationship which are exactly such as would follow from this form of marriage. To-day I begin by considering other forms of Melanesian marriage which bring out almost as clearly and conclusively the dependence of the classificatory terminology upon social conditions.