May 3i, 1924 Cell Sap Density and Environmental Conditions 
865 
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 is italics represent averages of two or more determinations] 
Species and locality 
Type 
Situation 
Alti¬ 
tude 
Date of 
collec¬ 
tion 
Depres¬ 
sion of 
freezing 
point 
Pinusbanksiana Lamb. 
Degrees 
Feet 
1920-1921 
C. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir. 
Northern aspect«.... 
7,450 
July 27 
1.07 
Pinus laricio corsicam 
Hort. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir. 
Northern aspect °_ 
7.450 
July 27 
1.28 
Pinus jeffreyi Murr. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir. 
Northern aspect 
7,450 
July 19 
1.38 
Pinus montana Mill. 
Ogden, Utah__ 
City park °_ 
4,350 
Jan. 25 
0.90 
Pinus monticola Dougl. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir.. 
Canyon bottom a _ 
7,400 
July 7 
1.41 
Do.... 
.do.. 
Northern aspect a _ 
7,450 
July 23 
1.15 
Pinus strobus L. 
Ogden, Utah_ 
City park °_ _ 
4,350 
Jan. 25 
1.23 
Picea excelsa Link. 
Big Cottonwood Can- 
Aspen-fir. 
Canyon bottom °.... 
7,400 
July 11 
1. 35 
yon. 
Do.. 
.do. 
.do . 
7,400 
4,350 
July 23 
Jan. 25 
1.18 
Ogden, Utah—. 
City park °_ 
0.93 
Larix occidentalis Nutt. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir. 
Northern aspect. 
7,450 
July 19 
1.60 
Thuja occidentalis L. 
Ogden, Utah.... 
City park «. 
4,350 
Jan. 25 
2. 72 
Thuja orientalis L. 
Ogden, Utah. 
City park °. 
4,350 
...do.— 
1.73 
Acer grandidentatum 
Nutt. 
Big Cottonwood Can¬ 
yon. 
Stream-bank. 
Canyon bottom . . 
4, 500 
July 21 
L 64 
Do... 
Western yellow pine. 
.do... 
Southern aspect.. 
6,400 
6,400 
7,450 
...do_ 
1.83 
Do.. 
_do_1_ 
Sept. 22 
July 26 
1.44 
1.43 
Do. 
Aspen-fir. 
Lower southern 
Do. 
aspect. 
.do. 
_do.... 
7,450 
7,700 
Sept. 7 
Sept. 9 
1.44 
1. 52 
Do. 
_do. 
Northwestern aspect. 
Acer glabrum Torr. 
Big Cottonwood Can¬ 
yon. 
Aspen-fir.. 
Northern aspect. 
7,500 
July 13 
1.17 
Acer negundo L. 
Big Cottonwood Can¬ 
yon. 
Stream-bank. 
Canyon bottom.. 
4,300 
July 18 
0.09 
Do.. 
.do.. 
.do. 
4,400 
6,800 
July 21 
...do. 
1.09 
Do.... 
_do. 
.do. 
1.06 
° Planted, species exotic to this site. 
Os¬ 
motic 
pres¬ 
sure 
Atmos¬ 
pheres 
12.9 
15.4 
16.6 
10.8 
17.0 
13.8 
14.8 
16.2 
14.2 
11.2 
19.2 
32.6 
20.8 
19.7 
22.0 
17.8 
17.2 
17.8 
18.3 
14.1 
13.1 
13.1 
12.8 
