May 3i, 1924 Cell Sap Density and Environmental Conditions 
883 
Table XIII .—Freezing point depressions and osmotic pressures of the sap of herbs 
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 
De¬ 
pres¬ 
sion of 
freez¬ 
ing 
point 
Os¬ 
motic 
pres¬ 
sure 
Melica spectabilis Scribn. 
Spruce-fir... 
Southern aspect.. 
Feet 
10,000 
mi 
July 15 
Degrees 
C. 
1.08 
Atmos¬ 
pheres 
13.0 
Mertensia sampsonii Tidestrom 
Spruce-fir.... 
Southern aspect.. 
10,000 
July 14 
0.81 
9.8 
Opuntia polyacantha Haw. 
Oak brush.... 
Sagebrush flat. 
7,400 
July 19 
0.54 
6.5 
Orthocarpus tolmiei H. & A. 
Spruce-fir._... 
Southern aspect.-. 
10,000 
July 14 
1. 36 
16.4 
Osmorrhiza obtusa (Couit. & Rose) Fer- 
nald 
Spruce-fir.... 
N orthern aspect. 
10,000 
July 18 
1.05 
12.6 
Oxyria digyna (L.) Hill 
Spruce-fir. 
Northern aspect 
10,000 
July 22 
0.62 
7.5 
Paeonia brownii Dougl. 
Aspen-fir.... . 
Western aspect a 
8,700 
July 25 
1.14 
13.7 
Pentstemon procerus Dougl. 
Spruce-fir.... 
Southern aspect .. 
10,000 
July 12 
1.84 
16.1 
Phacelia sericea (Graham) A. Gray 
Spruce-fir.... 
Northern aspect . 
10,000 
July 15 
1.41 
17.0 
Plantago tweedyi A. Gtay 
Spruce-fir... 
Northern aspect_ 
10,000 
July 18 
0. 70 
8.4 
Poa nevadensis Vasey 
Spruce-fir..... 
Southern aspect.. 
10,000 
July 24 
1.50 
18.0 
Polemonium occidentale Greene 
Aspen-fir... 
Northern aspect . _ 
8,700 
10,000 
July 14 
July 18 
July 12 
1.08 
13.0 
Spruce-fir... 
_ _ do 
1.11 
13.4 
Do..... 
Southern aspect 
10,000 
1.01 
12.2 
Polygonum douglasii Greene 
Aspen-fir.... 
Northern aspect 
8,700 
July 25 
0.79 
9.5 
Potentilla filipes Rydb. 
Spruce-fir..... 
Southern aspect _ . 
10,000 
July 12 
0.98 
11.8 
Pseudocymopterus tidestromii Couit. & 
Rose 
Spruce-fir... 
j 
Southern aspect. 
10,000 
July 12 
1.82 
15.9 
Ranunculus inamoenus Greene 
Spruce-fir... 
Northern aspect 
10,000 
10,000 
July 18 
July 15 j 
1 
j 
1.16 
14.0 
Do... 
Southern aspect 
1.46 
17.6 
Rudbeckia occidentalis Nutt. 
Aspen-fir.... 
Northern aspect. 
8,700 
July 18 
0.99 
11.9 
a Exotic to this site, planted. 
