106 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 66 
and Hidatsa, on being transcribed, are found to be of a simpler 
type than those of the Chippewa and Sioux which have been analyzed. 
Specimens of the musical instruments collected among both tribes 
include a drum, the rattles used by certain societies, and a whistle 
resembling a flageolet but without finger holes, on which a wide 
range of tones can be played (fig. 126). Specimens illustrating the 
material culture of the tribes were collected, and photographs illus- 
trating their dwellings and daily occupations were made (figs. 
127-130). 
A new phase of Miss Densmore’s investigations consisted in the 
making of pitch-discrimination tests. This was done by means of 
Fic. 130.—Mandan woman tanning a hide at entrance of earth lodge. 
a set of I1 tuning forks, the fundamental fork having a pitch of 
435 vibrations (a above middle c, international pitch), and the re- 
maining forks bemg tuned respectively, 4, 1, 2,.3, 5, 8, 12; 17, 23; 
and 30 vibrations higher. These tests were made on both Mandan 
and Hidatsa Indians and the results recorded. 
After leaving the Fort Berthold Reservation Miss Densmore visited 
the Standing Rock Reservation in North Dakota and the White Earth 
Reservation in Minnesota for the purpose of making similar tests 
among the Sioux and the Chippewa. The results of these tests 
show that some Indians have a pitch discrimination of three vibra- 
tions, or one-eighteenth of a tone, while others can discern only an 
interval of five vibrations, or one-eleventh of a tone. The method 
used in these tests is that of Prof. C. E. Seashore, of the State Uni- 
