In order to become familiar with the general character of Tusayan ruins, I made a brief reconnoissance of those mentioned in the following list, from which I selected Awatobi and Sikyatki as places for a more exhaustive exploration. This list is followed by a brief mention of those which I believe would offer fair opportunities for a continuation of the work inaugurated. The ruins near Oraibi were not examined and are therefore omitted, not that they are regarded as less important, but because I was unable to undertake a study of them in the limited time at my disposal. There are also many ruins in Tusayan, north of the inhabited pueblos, which have never been described, and would well repay extended investigation. Some of these, as the ruins at the sacred spring called Kishuba, are of the utmost traditional importance. I. _Middle Mesa ruins_--(1) Old Shuñopovi; (2) Old Mishoñinovi; (3) Shitaumû; (4) Chukubi; (5) Payüpki. II. _East Mesa ruins_--(1) Kisakobi; (2) Küchaptüvela; (3) Küküchomo; (4) Tukinobi; (5) Kachinba; (6) Sikyatki. III. _Ruins in Keam's canyon_. IV. _Jeditoh valley ruins_--(1) Bat-house; (2) Jeditoh, Kawaika; (3) Horn-house; (4) Awatobi; Smaller Awatobi. This method of classification is purely geographical, and is adopted simply for convenience; but there are one or two facts worthy of mention in regard to the distribution of ruins in these four sections. The inhabited pueblos, like the ruins, are, as a rule, situated on the eastern side of their respective mesas, or on the cliffs or hills which border the adjacent plains on the west. This uniformity is thought to have resulted from a desire to occupy a sunny site for warmth and for other reasons. The pueblos at or nearest the southern ends of the mesas were found to be best suited for habitation, consequently the present towns occupy those sites, or, as in the case of the Jeditoh series, the pueblo at that point was the last abandoned. The reason for this is thought to be an attempt to concentrate on the most inaccessible sites available, which implies inroads of hostile peoples. For the same reason, likewise, the tendency was to move from the foothills to the mesa tops when these invasions began. Early settlers near East Mesa appeared to have chosen exposed sites for their pueblos. This would imply that they feared no invasion, and legendary history indicates that the first pueblos were erected before the hostile Ute, Apache, and Navaho appeared. The early settlements on Middle Mesa were also apparently not made with an absorbing idea of inaccessibility. All the Jeditoh villages, however, were on the mesa tops, these sites having been selected evidently with a view to protection, since they were not convenient to the farms.