IV SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I47 



report on the Chaco Canyon phase of his subject was available for 

 publication. As yet there has been no such report. Dr. T. Dale Stewart 

 of the U. S. National Museum has examined for the Pueblo Bonito 

 Expeditions all skeletal material collected at Pueblo Bonito by the 

 National Geographic Society and by the Hyde Expeditions. Com- 

 pletion of our study of Chaco Canyon small-house sites, including 

 those examined by the late Monroe Amsden under special permit from 

 the Department of the Interior, now seems unlikely. 



Admittedly, the present volume appears a long while after conclu- 

 sion of field-work at Pueblo Bonito. Nevertheless, most of our find- 

 ings have been readily accessible and have been utilized by other 

 students. Dr. A. E. Douglass's now widely used tree-ring calendar 

 received its first real impetus at Pueblo Bonito in 1922 and attained 

 its goal, the dating of Pueblo Bonito, 7 years later at Show Low, Ariz. 

 Since 1929 that calendar, greatly expanded by former Douglass stu- 

 dents and others, has become a principal dependence of archeological 

 research in the Southwest. 



Dr. Kirk Bryan's 1924 and 1925 studies of sedimentation in Chaco 

 Canyon have become the model for similar studies elsewhere. 

 Dr. Frank H. H. Roberts, Jr., has drawn upon his 1925-1926 ob- 

 servations to illuminate each of his important publications on South- 

 western archeology, 1930-1940, and these, in turn, have been the 

 reliance of other archeologists. Our groundplan of Pueblo Bonito, 

 lent for display at the Chaco Canyon National Monument, was re- 

 produced by Gladwin (1945, fig. 17) and by McNitt (1957, p. 342). 

 Only the details of our architectural investigations remained for 

 presentation. 



As previously explained (Judd, 1954, vii), the Chaco Canyon 

 explorations of the National Geographic Society began with a 1920 

 reconnaissance which I was invited to lead. Upon conclusion of that 

 survey a report was submitted to the Society's Committee on Research, 

 Dr. Frederick V. Coville, chairman, and the Pueblo Bonito Expedi- 

 tions were initiated the following year, 1921. 



Pueblo Bonito was chosen for intensive investigation because it 

 was judged both the oldest and largest of the 15 major Chaco Canyon 

 ruins. Despite previous partial excavation by the Hyde Exploring 

 Expeditions from the American Museum of Natural History, Pueblo 

 Bonito was considered most likely to reveal those factors which had 

 brought about the high Chaco Culture, a principal objective of the 

 Society's Committee on Research. That this objective was not fully 



