Siouan Tribes of the East
The Siouan Tribes of the East was Mooney’s most speculative work. He began the shorter monograph even before he finished writing his study of the Ghost Dance. An indication of his maturing scholarship was his increasing ability to carry on separate lines of research simultaneously. The study had its roots in the work he accomplished thus far on the Indian synonymy, and in the extensive review of the literature of early exploration most recently incorporated in his article on the Potamic tribes. His inspiration came from the linguistic work done in the early 1880’s by Albert Gatschet, his friend and colleague at the bureau.