40 
BULLETIN 794, U. S. DEPARTMENT OE AGRICULTURE. 
This probably explains its absence from Loup Biver and the Garden 
County lakes. 
In attempting to stock alkaline waters with wild-duck foods, there- 
fore, it will be best to center efforts upon establishing widgeon grass 
or sago pondweed. Wild celery withstands salt as well as these two 
plants and probably would equal them in alkali resistance, though 
this has not been tried out. A purely theoretical suggestion is that 
eelgrass (Zostera marina), an inhabitant of ocean-water, might be 
found adapted to stronger alkaline waters than any of these three 
plants. 
LIST OF PLANTS OF THE SANDHILL LAKES. 
The descriptions of lakes given in the following pages, the classi- 
fication of the plants according to their place of growth, and notes 
on abundance are taken in the main from the reports of Mr. Ray 
Thomson. He is responsible, therefore, for the bulk of the occur- 
rence records. These are based on a system of " collector numbers " 
which he used in making his reports, and were translated into plant 
names after the specimens were identified in Washington. Where 
specimens from any locality were actually examined an asterisk (*) 
follows the name of the species. Remarks other than those on abun- 
dance, and a few other obvious field observations, are based on 
specimens. 
Each list is followed by a paragraph commenting on the value of 
its components as food for wild ducks. 
LIST OF LAKES VISITED, WITH DATES, 1915. 
Brown County 
Enders Lake Aug. 10, 14 (p. 41). 
Enders Lake Overflow_Aug. 11 (p. 42). 
Marsh Lake Aug. 12, 13 (p. 43). 
Rat Lake Aug. 14 (p. 44). 
Willow Lake Aug. 15 (?) (p. 44), 
West Chain Lake Aug. 16 (p. 45). 
Middle Chain Lake Aug. 16 (p. 46). 
Cheeky County (Eastern Part). 
Dewey Lake Aug. 21-24 (p. 46). 
Willow Lake Aug. 23, 24 (p. 48). 
Clear Lake Aug. 25 (p. 49). 
Hackberry Lake Aug. 27 (p. 50). 
Watts Lake Aug. 29 (p. 51). 
Trout Lake Aug. 31 (p. 52). 
Pelican Lake Sept. 1 (p. 53). 
Rat Lake Sept. 3. 4 (p. 54). 
Beaver Lake Sept. 3, 4 (p. 55). 
Wendler Swamp Sept. 4, 10 (p. 55). 
Sweetwater Lakes Sept. 6 (p. 56). 
Twenty-one Lake Sept. 6 (p. 57), 
Marsh Lakes Sept. 7 (p. 58). 
Red Deer Lake Sept. 10 (p. 59). 
Ballard Swamp Sept. 10 (p. 59). 
Big Alkali Lake Sept. 13 (p. 60), 
Molly Marsh __Sept. 13 (p. 61), 
Hay Lake Sept. 14 (p. 62), 
Cherry County (Northern Part). 
South Cody Lake__Sept. 18-19 (p. 62). | North Cody Lake Sept. 20 (p. 64), 
