Most of the data on which this monograph is based were collected by Edward Sapir, whose field studies of the Navaho language began about 1927 and continued with many interruptions until his death in 1939. The data were given to me with the request that I prepare them for publication. Although Sapir's Navaho texts were edited and published in 1942, various other claims on my time have long delayed publication of the present grammatical study. - Harry Hoijer