the Bitter Boot Valley in an area from 4 to 10 miles wide and 90 miles long. Xo 
case has ever been known to originate in ^Montana outside of this territory, except 
7 cases in an area about half a mile wide and 2 miles long in the narrow canyon 
of Rock Creek, about 20 miles east of the Bitter Root Valley. Later (1903a, p. 42) 
they modify this statement to read that “few, if any, cases have ever been known to 
originate in Montana outside of this territory, etc.” Still later (1904a, pp.. 33-34') 
they say that the cases in Montana are confined to the eastern foothills of the Bitter 
Root Mountains, but they refer also to 8 Rock Creek cases and to 2 cases in a valley 
near Bridger, Mont., about 250 miles east and 75 miles south of Bitter Root Valley. 
These latter cases are evidently those reported by Gates (1903, pp. 48-51) at Ther- 
mopolis (IVyo.) and near Bridger (Mont.). 
Anderson (1903a, p. 506) mentions the disease in Montana, particularly for the 
Bitter Root Valley (from Lo Lo to Como) and Rock Creek, but later (1903c, p. 4) 
refers also to Gates’s cases near Bridger. 
Daring the season of 190L I observed (through courtesy of the attend- 
ing physicians) 10 of the 11 cases in the Bitter Root ^htlley, distributed 
as follows: 
Case 1 . — Supposed to have become infected at or near a sawmill on Grant Creek, 
6 miles north of Missoula; this was reported as being the first case in that locality. 
Patient was taken to Missoula. 
Case i*.— Patient infected 3 miles west of Victor, on west side of Bitter Root River. 
Case 3 . — Xear Carlton, on west side of Bitter Root River. Patient was taken to 
Missoula. 
Case — In Pattee Canyon, on east side of Bitter Root River, 3 miles east of Fort 
Missoula. There is no evidence that the patient had visited the west side. 
Case 5 . — Xear Woodman, up the Lo Lo Creek, west side of Bitter Root River. 
Patient was taken to Missoula. 
Case 6 . — Supposed to have become infected at Harvey Creek, about 20 miles east 
of Florence. 
Case 7. — About 8 miles southwest of Hamilton; on west side of Bitter Root River, 
Case 8 . — Taken sick in Missoula; had not recently been up on the west side of the 
Bitter Root River, but had visited Bonner, east of Missoula, just prior to illness. 
Case 9 . — Xear Florence, west side of Bitter Root River. Patient taken to Missoula. 
Case 10 . — Left Iowa six weeks previously; had been in Bozeman five weeks; arrived 
in iMissoula June 2, changing cars en route to Hamilton; began to feel indisposed 
about the time he changed cars; taken worse in Hamilton (east side of Bitter Root 
River); later taken to 5Iissoula. 
Case 11 . — Had been in the United States four weeks; came to Missoula about June 
1; remained here five days, then moved to a ranch near Woodman, up the Lo Lo 
Creek, we.^t side of Bitter Root River. Patient taken to ^lissoula. 
From this will be seen that of the 11 cases in question 6 cases, 
Xos. 2. 3. 5. 7. 9. 11. appear to have become infected on the west side of 
the Bitter Root River, while 5 cases show no history of having visited 
that locality (except case 10, see below, p. 27) immediately prior to 
infection. One case (Xo. 1) appears to have become infected on the 
east side of the Bitter Root River. One case (Xo. 1) seems to have 
been infected up Grant Creek. One case (Xo. 6) appears to have been 
infected on the west side of Harvey Creek some distance east of the 
Bitter Root River. One case (Xo. 8) seems to have become infected 
either at Bonner or at Missoula; and one case (Xo. 10) seems to have 
become infected somewhere between Bozeman and Hamilton, going 
