914 
Journal of Agricultural Research voi. xxvn, no. r 
There are large springs near the northern end of the Stansbury Moun¬ 
tains, which have small run-off streams which feed limited grass-flat 
areas, but their waters are soon lost in the sterile mud flats. The con¬ 
centration of the water of these springs has not been studied in detail, 
but is much less than that of the ground water as noted above. Sample 
io was taken from a large spring at the northern end of the Stansbury 
Mountains. Sample n was collected from the drainage channel from 
this spring on June 12. These values show a relatively low concentration, 
as compared with those given above, but the water soon reaches high 
concentration through evaporation. This is shown by the results for 
sample 12 collected on the same date (June 12) from a depression in 
the mud flats, and which had probably in part been derived from these 
same springs. The results indicate that the concentration of the ground 
water varies enormously in relatively short distances, and suggest that 
the sheet of water must be derived in large part from higher levels. 
Near Bermester there are calcareous rings which indicate the presence 
of active springs at an earlier period. 
The constants show the great variations of concentration to which 
the species which struggle for existence in this region may be subjected. 
The determinations on the plant species are given in Table XIII. 
Table XIII.— Physicochemical constants for species of the salt flats 
Growth form and species. 
Date. 
Freezing 
point 
depres¬ 
sion, 
A. 
Atmos¬ 
pheres 
osmotic 
concen¬ 
tration, 
P. 
Specific 
electrical 
conduc¬ 
tivity, 
K. 
Ratio, 
conduc¬ 
tivity to 
depres- 
ctrvn 
k/A. 
Chlo- 
rids 
per 
liter, 
Cl. 
SHRUBS AND HALE SHRUBS 
Allenrolfea occidentalis (S. Wats.) 
1920. 
Kuntze. 
May 28 
2.96 
3^.6 
0.062 5 
0.0212 
June 8 
2-45 
OJ * 
29.4 
.0526 
.0430 
14.7 
June 12 
4.26 
$1.0 
.0808 
.0189 
25.O 
June 18 
4.06 
48.6 
.0689 
.0170 
26.1 
July 1 
4.27 
.0797 
.0186 
25-7 
Average. 
3.60 
43 -i 
.0689 
.0238 
22.9 
Salicornia utahensis Tidest. 
June 8 
3-07 
36.8 
.0658 
.0214 
25-5 
June 12 
3-66 
43*9 
•0783 
.0213 
37 -i 
ft 
June 18 
3*56 
42.7 
.0686 
.0192 
3 ° *4 
...do. 
3-49 
41.8 
.0664 
.0190 
30-3 
...do. 
4.14 
49.8 
•0773 
.0187 
36. 1 
July 1 
4-34 
51-9 
.0820 
.0189 
25-7 
...do. 
3.42 
41.0 
.0693 
.0202 
28.4 
...do. 
3- 2 5 
389 
.0668 
.0205 
26.8 
Average.. 
3.62 
43-4 
.0718 
.0199 
30.0 
Sarcohatus vermiculatus (Hook.) 
Torr... 
May 28 
2.25 
27. I 
.0467 
.0207 
ANNUAL HERBS 
Atriplex hastata L. 
June 8 
2.15 
25.8 
.0479 
.0223 
June 11 
3.61 
43-3 
.0659 
.0182 
24-3 
Average. 
2.88 
34-6 
.0569 
.0203 
24.3 
