872 
Journal of Agricultural Research voi. xxviii, no. 9 
Table IX. —Freezing point depressions and osmotic pressures of the sap of herba¬ 
ceous plants, including grasses and a moss on Big Cottonwood Canyon water¬ 
shed, classified by species, type, situation, altitude, and date of collection —Con. 
[Figures in italics represent averages of two or more determinations] 
Species and type 
Situation 
Alti¬ 
tude 
Date of 
collection 
Depres¬ 
sion of 
freezing 
point 
Os¬ 
motic 
pres¬ 
sure 
Aster eatonii (A. Gray) Howell 
Aspen-fir_ ___ __ _ 
Northern aspect___ 
Feet 
7,460 
mo 
Sept. 10 
Degrees 
a 
0.9S 
Atmos¬ 
pheres 
11.2 
Aster adscendens Lindl. 
Spruce-fir_ 
Eastern aspect. 
9,000 
Sept. 9 
0.82 
9.9 
Aster engelmannii A. Gray (— Eucephalus 
engelmannii (A. Gray) Greene) 
Spruce-fir........ 
Eastern aspect__ 
8,950 
...do_ 
1.48 
17.8 
Aster glaucus T. & G. (= Eucephalus glau- 
cus Nutt.) 
Chaparral___ 
Southern aspect. 
7,550 
7,450 
July 26 
1.42 
17. 1 
Aspen-fir___ 
_do___ 
Sept. 7 
1.29 
15. 5 
Atragene Columbiana Nutt. (Clematis 
columbiana ((Nutt.) Torr. & Gray) 
Aspen-fir___ 
Northern aspect. 
7,450 
July 12 
1.37 
16. i| 
Balsamorrhiza sagittata (Pursh) Nutt. 
Chaparral.... 
Southern aspect... 
7,550 
7,550 
July 16 
1.73 
20.8 
Do__ _ ... 
do .. 
Sept. 6 
1 . 76 
21.2 
Bromus richardsonii Link. 
Spruce-fir.... 
Northern aspect. 
8,950 
Sept. 12 
1.14 
13.7 
Caltha leptosepala Hook. 
Spruce-fir__ 
Northern aspect. 
9,500 
July 15 
0.99 
11.9 
Castilleja lancifolia Rydb. 
Aspen-fir.. 
Northern aspect. 
7,500 
July 13 
1.71 
20.6 
Castilleja linariaefolia Benth. 
Chaparral___ 
Southern aspect__ 
7,500 
July 19 
Sept. 6 
Sept. 7 
July 22 
1.91 
23.0 
Do___ 
_do.. 
7,500 
7,500 
7,450 
1.88 
22.0 
Do_ ... ...». 
do. __ _ 
2.23 
26.8 
Castilleja miniata Dougl. 
Aspen-fir..... 
Northern aspect. 
1. 55 
18.6 
Castilleja rhexifolia Rydb. 
Spruce-fir____ 
Northern aspect. 
10,000 
8,950 
July 15 
Sept. 9 
1. 65 
19.8 
Do. 
Eastern aspect.. 
1.89 
22.7 
Chamaenerion angustifolium (L) Scop. 
Aspen-fir... 
Northern aspect. 
7,450 
8,950 
July 17 
Sept. 9 
0.80 
9.6 
Spruce-fir. 
Eastern aspect.. 
0.91 
11.0 
Chrysopsis fulcrata Greene 
Spruce-fir_____ 
Eastern aspect. 
9,000 
.do.. 
0.99 
11.9 
Cirsium undulatum (Nutt.) Spreng. 
Aspen-fir. 
Lower southern aspect.... 
7,450 
Sept. 7 
1.24 
14.9 
Drymocallis glandulosa (Nutt.) Rydb. 
Aspen-fir_ 
Northern aspect_ 
7,450 
9,000 
July 22 
July 25 
July 15 
1.19 
14.3 
Spruce-fir__ 
.do.1.. 
0.77 
9.8 
Do... 
Northern aspect (open)... 
lOiOOO 
1.81 
15.8 
Aspen-fir..____ 
Lower southern aspect.... 
7,450 
8,850 
Sept. 6 
0.85 
10.2 
Spruce-fir. 
Eastern aspect, (open)- 
Sept. 9 
1.45 
17.4 
