[Note: this transcription was produced by an automatic OCR engine] l . ll ll. ‘ . K l xxii PREFACE Complexity of culture differentiation. . . . The isolation of groups is most remarkable : this of course may be due in part to geographical causes~mountains, and to differences of dialect (a consequence of the former). A striking case is the Big Nambas.â€ù In an unï¬Ånished letter to me dated 30th October, 1926, Deacon reports as having left Lamburnbu, where he had spent four months entirely alone and as being then at Bushman‘s Bay, at the middle of the east coast of the island. At the beginning of November he went to the islet of Atchin off the north-east coast, and thence to the Big Nambas territory in the north-west of the island. He was permitted to pay only a brief visit to these people, but remarkable sociological information was nevertheless obtained. Deacon collected ten male skulls of the Big Narnbas which he rightly considered " rather remarkable â€ù and he gave a good technical description of them, they were of a more savage or ‘low’ type than he had seen elsewhere. As a matter ~of fact they are of the same type as certain skulls from the interior of Fiji and from other spots in Melanesia, and evidently indicate an ancient stock of mankind. All the skulls collected by Deacon were sent to Sydney, together with the numerous measurements of natives and other observations on physical anthropology. It is hoped that this material will be described and published ‘by Professor Burkitt. Deacon appears to have retumed to Bushman's Bay after his visit to the country of the Big Nambas, and then Went to Ambrym where he stayed for six weeks during January and February, 1927, and investigated the regulation of MARRIAGE in four linguistically distinct areas. In a letter to me he wrote: “I am really rather excited at the moment. I have found in Ambrym a system of MARRIAGE classes, still in full working, of the type of those among the Central Australian tribes, though not actually corresponding with the Australian system. . . . For me it clears up a great deal, even in Malekula. . ., . To me it is like a sudden illumination. The day after I had got the ï¬Ånal proof of the thing I simply did nothing, just had an absolute rest, ate my best biscuits and tinned peaches and felt that nothing mattered now. . . . I think this Ambrym system is my greatest stroke of luck.â€ù He expresses surprise that it had not been described before, since “the older men explained the system T; K