Methods of presentation -- The naven ceremonies -- The concepts of structure and function -- Cultural premises relevant to the wau--laua relationship -- Sorcery and vengeance -- Structural analysis of the wau-laua relationship -- The sociology of naven -- Problems and methods of approach -- The ethos of Iatmul culture : the men -- The ethos of Iatmul culture : the women -- Attitudes towards death -- The preferreed types -- Ethological contrast, competition and schismogenesis -- The expression of ethos in naven -- The eidos of Iatmul culture -- Epilogue 1936 -- Epilogue 1958.