"Contains several previously unpublished reports and letters by German ethnographer of Brazilian indigenous peoples. Begins with first ethnographic description of the Kaingangue, including particularly valuable notes on ceremonial organization and symbolism. Second report deals with the ethnohistory and process of extermination of the Opaye. Final entry constitutes letters written from Pará providing information on a series of groups in the region. Excellent biographical introduction"--Handbook of Latin American Studies, v. 57.