May si, 1924 Cell Sap Density and Environmental Conditions 
877 
Table XI .—Freezing point depressions and osmotic pressures of the sap of trees 
on Ephraim Canyon watershed, central Utah, classified by species, type, situation, 
altitude, and date of collection —Continued 
[Figures in italics represent averages of two or more determinations] 
Species and type 
Situation 
Alti¬ 
tude 
Date of 
collec¬ 
tion 
Depres¬ 
sion of 
freez¬ 
ing 
point 
Os¬ 
motic 
pres¬ 
sure 
Pseudotsuga taxifolia (Lam.) Britton 
Oat hnish _ __ 
Northern aspect b .. 
Feet 
7,400 
mi 
July 19 
July 26 
Degrees 
c. 
1.65 
Atmos¬ 
pheres 
19.8 
Do. 
.do_I. 
7,400 
1.24 
14.9 
\ span-fir _ _ 
W estem aspect... 
8,800 
July 14 
1.92 
23.1 
Do .. 
.do_I. 
8,800 
July 22 
1.66 
20.0 
Do . . 
Northern aspect. ..— 
8,800 
July 24 
July 26 
1.39 
16.7 
Abies concolor (Gord.) Parry 
Oat brush 
Northern aspect. 
7,400 
8,800 
1.65 
18.6 
A span-fir _ __ 
Western aspect_ 
July 14 
1.66 
19.8 
r Do _ 
Northern aspect... 
8,800 
July 24 
1.20 
14.4 
Picea parryana (Andr6) Parry 
Ofik brush . .. _ __ 
Northern aspect. 
7,400 
8,700 
July 26 
1.04 
12.5 
\ span-fir __ __ 
Western aspect- .. 
July 14 
1.43 
17.2 
r T)n _ 
Northern aspect- .. 
8,800 
July 24 
1.08 
13.0 
Pinus flexilis James 
A span-fir 
Northern aspect. 
8,800 
July 24 
1.10 
13.2 
SnniPfi-flr _ _ 
Southern aspect.... 
10,000 
10,000 
July 18 
1.20 
14.4 
Do _ _ 
.do_’..... 
July 22 
l.U 
IS. 7 
Picea engelmanni (Parry) Engelm. 
Aspen-fir _ _ 
Western aspect -.. 
8,800 
July 14 
1.23 
14.8 
r Rn __ - 
Northern aspect. 
8,800 
July 24 
a 97 
11.7 
PpmnA-fh* . _ 
.do.I. 
10,000 
July 18 
1.37 
16.5 
*” Do __ _ _ 
.do... 
10,000 
July 22 
1.17 
14.1 
Do . 
Southern aspect—. 
10,000 
July 18 
1.16 
14.0 
Do . 
.do. 
10,000 
July 22 
1.15 
IS. 8 
Abies lasiocarpa (Hook.) Nutt. 
IN 
Oat brush _ _ _ _ 
Northern aspect - .. 
7,600 
July 26 
1.24 
14.9 
Aspen-fir __ 
Western aspect.. 
8,700 
July 14 
1.37 
16.5 
r j)o . _ 
Northern aspect. 
8,800 
July 24 
1.01 
12.2 
Spruce-fir _ 
10,000 
July 15 
1.19 
14.3 
r Do _ _ _ 
.do.. 
10,000 
July 18 
0.65 
7.8 
Do . 
.do__. 
10,000 
July 22 
0.78 
9.4 
Do . 
Southern aspect_ 
10,000 
July 18 
1.36 
16.4 
Do ..-. 
.do.~. 
10,000 
July 22 
0.98 
11.8 
Acer grandidentatum Nutt. 
Oat brush _ _ 
Northern aspect. 
7,400 
July 19 
1.38 
16.6 
Acer glabrum Torr. 
\ «;ppn-fir _ 
Northern aspect - .. 
8,800 
July 24 
1.07 
12.9 
Populus tremuloides Michx. 
Opt brush _ __ 
Northern aspect. 
7.800 
8.800 
9,600 
July 26 
1.96 
23.6 
A snan-fir _ _ 
Western aspect__ 
July 14 
2.29 
27.5 
Spruc^flr - - - _ 
Southern aspect_ 
_do.... 
2.17 
26.1 
Do - - _ 
9,600 
July 18 
2.19 
26.3 
b Planted, although native to site. 
96039—24t--3 
