22 BUREAU OF AMERICAN ETHNOLOGY 
ruin, in the Fifteenth Annual Report. It was not until the excava- 
tions conducted by Doctor Fewkes, however, that an adequate 
knowledge of the character and importance of the great house clus- 
ters was obtamed, and this knowledge, together with such historical 
data as are available, is now embodied in the present volume as a per- 
manent and final record. A preliminary report of Doctor Fewkes’ 
work at Casa Grande during the first season has been published in the 
Smithsonian Miscellaneous Collections. 
A second paper by Doctor Fewkes sammarizes the results of his 
investigations of the Antiquities of the Upper Verde River and Wal- 
nut Creek Valleys, Arizona. This report is preliminary in character 
and is supplementary to the memoir by Mr. Cosmos Mindeleff pub- 
lished in the Thirteenth Annual Report of the Bureau on the arche- 
ology of the lower valley of the Verde. No excavations have yet 
been conducted in the region of which Doctor Fewkes treats, yet suf- 
ficient evidence has been gathered from a study of the architectural 
features of the ruims now visible to enable a determination of the 
western limits of Pueblo culture in central Arizona and to define the 
area in which a distinct culture has its beginning. 
The memoir by Dr. Truman Michelson, being a Preliminary Report 
on the Linguistic Classification of Algonquian Tribes, with a map, is 
based on the author’s studies for the Bureau during the years 1910- 
1912. The Algonquian tribes are now found to be divided linguist- - 
ically into four major groups, Blackfoot, Cheyenne, Arapaho, and 
Eastern-Central. The results of Doctor Michelson’s observations 
elucidate many questions formerly existing with respect to the inter- 
relations of the various Algonquian languages and dialects. The 
map illustrating the memoir was prepared with the cooperation of 
Dr. John R. Swanton. 
F. W. Hover, 
Ethnologist-in-charge. 
ApriL, 1912. 
