8 
the pathological organisms. Also problems in immunity, and 
effects of unfavorable environment. Field and laboratory. r 
F. S. Earle and Doctor Alex. P. Anderson. 
Economic Botany.—-Investigation of plant product. 
arts and sciences and of the methods employed in their produc- 
D. T. MacDouGat. 
s used in the 
tion. Professor Rusby. 
REPORT OF DR. D. T. MACDOUGAL, FIRST 
ASSISTANT, ON EXPLORATIONS 
IN MONTANA IN !go1. 
(Presented to the Scientific Directors Oct. 22, 1901, and ordered printed. ) 
Dr. N. L. Britton, Director-in- Chief : 
Dear Sir: 1 have the honor to submit the following account 
of my operations in Montana in June, July and August, Igo1. 
I left, New York June 1st and proceeded to Missoula, Montana, 
in accordance with arrangements made with the University of 
Montana for the codperation of the Garden in the biological ex- 
pedition to be sent out from that institution. The journey was 
broken by stops of a few days for the purpose of making collec- 
tions and observations in the valley of the Platte River, and in the 
sand hill region in northern Nebraska, in which more than two 
hundred species of living plants and herbarium specimens were 
obtained. 
Similar work was accomplished in the vicinity of Missoula, 
Montana, during the week in which the outfit of the expedition 
was being completed and an ascent of Sentinel Mountain, east of 
the city, was made. An arrangement was made, which has since 
been carried out, by which the entire collection of unmounted 
plants belonging to the university, numbering several thousand, 
was shipped to the Garden for investigation, the Garden to retain 
duplicates. President Craig and Professor M. J. Elrod, director 
of the biological expedition, made every effort to facilitate my 
work, and the plans of the expedition were arranged to give every 
possible opportunity for botanical work. . 
