ALGOLOGICAL NOTES 
П. PRELIMINARY List оғ ALGAE IN Devits LAKE, 
Хоктн DAKOTA 
GEORGE T. MOORE 
Director of the Missouri Botanical Garden 
Engelmann Professor in the Henry Shaw School of Botany of 
Washington University 
Devils Lake is situated in Ramsey County near the northern 
border of North Dakota. It is the largest body of water in 
the state, being about thirty miles long and over five miles 
wide at its broadest part. The especial point of interest as 
affecting the algal flora of Devils Lake is the alkaline char- 
acter of the water which has gradually increased with the 
diminishing size of the lake. Thus, from the year 1830 to 
1889 there is evidence that the water fell some sixteen feet, 
and since 1883 when the United States Geological Survey set 
a permanent bench mark, its level has been lowered about the 
same distance. This loss of water has not been uniform, since 
in some years owing to the heavy rains and snows over the 
drainage area the level has risen or been stationary. 
The total effect, however, has been to concentrate very con- 
siderably the dissolved salts and to make the conditions for 
algae very different from those usually found in inland fresh- 
water lakes. While the water is distinctly brackish to taste, 
with a salinity of about 1 per cent, it is of course not compar- 
able to sea-water with a salinity of from 3 to 4 per cent. 
Various analyses of the water have been made from time to 
time and from different localities, but the following made by 
the U. б. Bureau of Chemistry! is indicative of the relative 
proportion of the salts contained: 
Сезоне әсі Әй >. sea bos Wid cee oe es 145.1 
Hiearbonise acil а ed 538.9 
ЕРКЕЛІГІН 6.6 
СШӨҮШ Лу ыл ао. Уул гач о. 900.8 
ажал ұйы е Фа улова 14.8 
СБ a шеді 2124 ы rr 28.3 
Қанын Ты. Г ка UTOR 530.5 
Баланс ЩО 3002, Sak. ЩЕ: 4977 .9 
HEN. ooo uoo ЕЛШЕ бей ерес, 2108.3 
РЕ роба. ое 199.7 
8.4 
944 
1 First annual report of the Biological Station of North Dakota. p. 24. 1910. 
ANN. Mo. Вот. GARD., Vor. 4, 1917 (293) 
