May 3 i, 1924 Cell Sap Density and Environmental Conditions 
867 
Table VIII .—Freezing point depressions and osmotic pressures of the sap of shrubs 
classified by species, locality, type, situation, altitude, and date of collection —Con. 
[Figures in italics represent averages of two or more determinations] 
Species and locality 
Type 
Situation 
Alti¬ 
tude 
Date of 
collec¬ 
tion 
Depres¬ 
sion of 
freezing 
point 
Os¬ 
motic 
pres¬ 
sure 
Purslua tridentata 
(Pursh) D. C. 
Degrees 
Atmos - 
Feet 
mo-1921 
c. 
pheres 
Big Cottonwood Can- 
Juniper.. 
Southern aspect_ 
5,000 
July 21 
1. 89 
22.7 
yon. 
Beaver Creek .. 
Sagebrush.. 
.do. .. 
7,400 
Sept. 16 
2.15 
25.8 
Gutierrezia filifolia 
Greene 
Big Cottonwood Can- 
Sagebrush.. 
.do... 
5,000 
Sept. 17 
2.55 
30.6 
yon. 
Rhus trilobata Nutt. 
Big Cottonwood Can- 
Stream bank_ 
Canyon bottom.. 
4,300 
July 8 
1.57 
18.9 
yon 
Do__ _ 
Juniper_ 
Southern aspect_ 
5,000 
July 21 
1.82 
21.9 
Rhus cismontana 
Greene 
Big Cottonwood Can- 
Stream bank.. 
Canyon bottom. 
4,300 
July 8 
1.37 
16.5 
yon. 
Do.. 
.do.. 
Southern aspect. 
4,500 
July 21 
1.56 
18.8 
Quercus ulahensis 
(DC.) Rydb. 
Big Cottonwood Can- 
Stream bank _ 
Canyon bottom_ 
4,300 
July 8 
1. 66 
20.0 
yon. 
Do 
_do_ _ 
Southern aspect__ 
4,500 
July 21 
1.84 
22.1 
Do.. 
Western yellow pine. 
Steep southern aspect 
6,400 
...do_ 
2. 07 
24.9 
Do__ 
Chaparral__ 
Southern aspect_ 
7, 550 
July 16 
1.80 
21.6 
Do__ _ 
Juniper.. 
.do__ 
5,200 
Sept. 17 
1.90 
22.8 
Do_ _ _ 
Western yellow pine.. 
_do.... 
M00 
Sept. 22 
1.68 
20.2 
Do.. 
Chaparral.. 
_do... 
7, 550 
Sept. 6 
1.95 
23.4 
Do__ 
Aspen-fir.. 
Northwestern aspect. 
7,700 
Sept. 9 
1.90 
22.8 
Beaver Creek.. 
Chaparral.. 
Southern aspect.*._ 
7,400 
Sept. 16 
2.00 
24.0 
Prunus melanocarpa 
(A. Nels.) Rydb. 
Big Cottonwood Can- 
Stream bank. 
Canyon bottom. 
4,300 
July 8 
1.81 
21.8 
yon. 
Do. 
Chaparral_ - 
Southern aspect. 
4,500 
July 21 
2.00 
24.0 
Do . 
.do_ __ 
_do. —*-.. 
7, 550 
Julv 26 
1.74 
20.9 
Do.. 
Aspen-fir.. 
Northern aspect. 
7,450 
July 17 
1. 52 
18.3 
Do.... 
Spruce-fir. ... 
Ridge top. —. 
10,000 
July 15 
* 1.95 
23.4 
Do_ 
Chaparral_ 
Southern aspect_ 
7; 550 
Sept. 7 
1. 55 
18.6 
Do_ . 
... .do. ... 
.do__ 
7,550 
Sept. 12 
1. 75 
21.0 
Do__ 
Aspen-fir_ 
Northwestern aspect. 
7; 700 
Sept. 9 
1. 87 
22.5 
Do... 
.....do. ... 
Northern aspect_ 
7,450 
Sept. 13 
1. 20 
14.4 
Do. 
Spruce-fir_ 
Eastern aspect. 
9,000 
Sept. 9 
2. 09 
25.1 
Cercocarpus ledifolius 
Nutt. 
Big Cottonwood Can- 
Chaparral.. 
Southern aspect. 
6,400 
July 21 
2.71 
32.5 
yon. 
Do_ 
do___ . 
. do .. 
7,550 
July 16 
1.50 
18.0 
Do . 
_do _ _ 
.do .. 
7,600 
July 26 
1.56 
18.8 
Do .. 
_do. .. 
. do . . 
6,400 
Sept. 22 
1.19 
14.3 
Do __ 
.do __ 
. do . 
7,550 
Sept. 6 
1.58 
19.0 
Do . 
do. _ 
_do .. 
6, 400 
Dec. 10 
2. 67 
32.0 
Do . 
.do __ 
.do .... 
7, 550 
Dec. 6 
2.60 
31.2 
Do .. 
_do .. 
. do .. 
5,200 
Jan. 4 
2.79 
33.5 
Taylor Canyon. .. 
_ do._ .. 
_ do... .. 
7, 600 
_ do ... 
2.99 
35.9 
Do ... 
.do .. 
_do_ 
7,000 
Feb. 28 
2.66 
31.9 
Do. . 
_do._. 
.do .. 
8,500 
...do _ 
2.60 
31.2 
Cercocarpus Montanus 
Raf. 
Beaver Creek . 
Chaparral.. . 
Ridge top. 
7,100 
Sept. 17 
2.04 
24.5 
