Between 1929 and 1936 he spent 14 months with the Canela Indians, a Gê-speaking people on the northeastern edge of the central plateau of Brazil, and his monograph on them, translated and annotated by Robert Lowie, was published posthumously in 1946.
Mellan 1929 och 1936 tillbringade han 14 månader med Canela indianerna, ett Gê-talande folk på den nordöstra kanten av det centralbrasilianska höglandet, och hans monografi om dem, översatt av Robert Lowie, publicerades postumt 1946.