On my return to Washington I was invited to prepare a preliminary account of my work in the field, which the Secretary of the Smithsonian Institution did me the honor to publish in his report for 1895. This report was of a very general character, and from necessity limited in pages; consequently it presented only the more salient features of my explorations. The following account was prepared as a more exhaustive discussion of the results of my summer's work. The memoir is much more extended than I had expected to make it when I accepted the invitation to collect archeological objects for the Museum, and betrays, I fear, imperfections due to the limited time spent in the field. The main object of the expedition was a collection of specimens, the majority of which, now on exhibition in the National Museum, tell their own story regarding its success. I am under deep obligations to the officers of the Smithsonian Institution, the National Museum, and the Bureau of American Ethnology for many kindnesses, and wish especially to express my thanks to Mr S. P. Langley, Secretary of the Smithsonian Institution, for the opportunity to study the ancient ruins of Tusayan. Nothing had a greater influence on my final decision to abandon other congenial work and undertake this, than my profound respect for the late Dr G. Brown Goode, who suggested the expedition to me and urged me to plan and undertake it. JESSE WALTER FEWKES. _Washington, May, 1897._ PLAN OF THE EXPEDITION It seemed to me in making a plan for archeological field work in 1895, that the prehistoric cliff houses, cave dwellings, and ruined pueblos of Arizona afforded valuable opportunities for research, and past experience induced me to turn my steps more especially to the northern and northeastern parts of the territory.[1] The ruins of ancient habitations in these regions had been partially, and, I believe, unsatisfactorily explored, especially those in a limited area called Tusayan, now inhabited by the Moki or Hopi Indians. These agricultural people claim to be descendants of those who once lived in the now deserted villages of that province.