866 
Journal of Agricultural Research 
Vol. XXVIII, No. 9 
Table VII .—Freezing point depressions and osmotic pressures of the sap of trees 
classified by species, locality, type, situation, altitude, and date of collection —Con. 
[Numbers 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 
Populus angustifolia 
James 
Feet 
mo-mi 
Degrees 
C. 
Atmos¬ 
pheres 
Big Cottonwood Can¬ 
yon. 
Stream-bank.. 
Canyon bottom.. 
4,300 
July 8 
1.46 
17.6 
Do... 
.do.. 
.do. 
4.400 
6.400 
7.400 
7,400 
July 21 
_._do. 
1.37 
16.5 
Do.. 
Western yellow pine. 
Aspen-fir.. 
Southern aspect_ 
1.66 
20.0 
Do... 
Canyon bottom_ 
July 14 
July 22 
1.54 
18.5 
Do... 
_do _ 
.do.. 
1.67 
20.1 
Populus tremuloides 
Michx. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir. 
Canyon bottom. 
7,450 
July 11 
1.82 
21.9 
Do___.. 
.do. 
Southern aspect_ 
7,500 
7,450 
7,500 
7,700 
7,700 
10,000 
10,000 
7,400 
July 19 
Sept. 6 
July 13 
2.26 
27.2 
Do.... 
_do... 
.do... 
2.37 
28.5 
Do. 
.do__. 
Northern aspect. 
1.74 
20.9 
Do... 
_do. 
.do. 
Sept. 7 
Sept. 9 
July 15 
2.02 
24.3 
Do.. 
_do.... 
.do... 
1.83 
22.0 
Do... 
Spruce-fir.. 
Ridge-top... 
1.92 
2S.1 
Do... 
. —do. 
Northern aspect __ 
Sept. 9 
Sept. 16 
2.09 
25.1 
Beaver Creek.. 
Lodgepole pine. 
Bench in canyon bot¬ 
tom. 
2.27 
27.3 
Alnus tenuifolia Nutt. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir. 
Northern aspect. 
7,500 
July 13 
1.12 
13.6 
Betula fontinalis Sarg. 
Big Cottonwood Can¬ 
yon. 
Stream-bank. 
Canyon bottom. 
4,300 
July 8 
1.36 
16.4 
18.0 
Do.„ 
Western yellow pine. 
Southern aspect. 
6,400 
July 21 
1. 50 
Crataegus rivularis 
Nutt. 
Big Cottonwood Can¬ 
yon. 
Stream-bank.. 
Canyon bottom. 
4,400 
...do-.. 
1.85 
22.2 
Table VIII .—Freezing point depressions and osmotic pressures of the sap of shrubs 
classified by species, locality, type, situation, altitude, and date of collection 
[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 
Artemisia tridentata 
Nutt. 
Big Cottonwood Can¬ 
yon. 
Do_ _ 
Stream bank.. 
Canyon bottom. 
Feet 
4,300 
5,000 
1920-1921 
July 8 
July 21 
July 19 
Degrees 
C. 
1.36 
Atmos¬ 
pheres 
16.4 
Sagebrush.. 
Southern aspect. 
2.51 
30.1 
Do ... 
Chaparral.. 
_do..—- 
7,600 
7,450 
5,000 
7,600 
8.500 
5,000 
7.500 
9,000 
1.66 
20.0 
Do.. 
Aspen-fir... 
Northern aspect. 
July 17 
Sept. 17 
Sept. 6 
Sept. 20 
Dec. 10 
1.27 
15.3 
Do . — 
Sagebrush... 
Southern aspect_ 
2.08 
25.0 
Do . — 
Chaparral.. 
_do..... 
1.82 
21.9 
Do.. 
Aspen-firl.. 
Northern aspect. 
1.41 
17.0 
Do-. _ .. 
Sagebrush. 
Southern aspect_ 
2. 06 
24.8 
Do. 
Chaparral_ 
.do. 
Dec. 6 
2.69 
32.3 
Do 
Aspen-fir. .. 
Ridge top.. 
Dec. 7 
1. 97 
23.7 
Beaver Creek 
Sagebrush.. 
Southern aspect_ 
7,400 
4,500 
5,200 
4,500 
5,200 
7,000 
Sept. 16 
Jan. 4 
2. 73 
32.8 
Taylor Canyon. .. 
_do... 
Very gentle western 
aspect. 
Southern aspect_ 
2. 85 
34.2 
Do . 
_do... 
...do_ 
3. 34 
40.0 
Do .. 
.do.. 
Very gentle western 
aspect. 
Southern aspect_ j 
Feb. 28 
2. 36 
28.3 
Do. 
.do.. 
...do_ 
2. 40 
28.8 
Do... 
_do.... 
_do—... 
...do.— 
2.31 
27.8 
