i8o 
ALFRED DACHNOWSKI AND R. GORMLEY 
4. The insufficiency of a salt operates as a limiting factor to growth 
but transpiration does not decrease consistently with the retardation 
in growth. 
5. The amount of water retained by plants is decreased when the 
strength of the solution is increased beyond a certain optimum con- 
centration. The available water rather than the solute is then the 
Table III 
Transpiration and Growth of Eriophorum virginicum in Glycocoll Solutions 
December 17, 1913, to January 17, 1914 
Culture solution 
Amoui 
Absorbed 
It of water in 
Transpired 
grams 
Retained 
Gain or loss in weight 
of plants (in grams) 
Distilled water 
7.00 
6.80 
0.20 
8.50 
8.10 
0.40 
0.60 
2. 
«/8oo glycocoll 
10.10 
9-30 
0.80 
11.60 
11.30 
0.30 
1.30 
3- 
w/i,6oo glycocoll 
10-55 
9.80 
0.75 
19-55 
18.40 
I-I5 
1.98 
4- 
11-85 
11.50 
0.35 
14-55 
13.90 
0.65 
1.20 
5. 
w/6,400 glycocoll 
11.80 
11.00 
0.80 
15.20 
14.10 
1. 10 
1-95 
6. 
w/i2,8oo glycocoll 
9.60 
8.80 
0.80 
25.40 
24.70 
0.70 
1-65 
New roots with roothairs near upper portion of rhizome, increasing in number 
in dilute solutions. Atmospheric conditions as in Table I. 
Table IV 
Transpiration and Growth of Eriophorum virginicum in HCl Solutions 
November 23 to December 17, 1913 
Culture solution 
1. Bog water. . . 
2. w/400 HCl. . . 
3. w/800 HCl. . , 
4. w/i,6oo HCl. 
5. w/3,200 HCl. 
6. w/i2,8oo HCl 
Amount of water in grams 
Absorbed 
Transpired 
Retained 
4-05 
3-70 
0.35 
3-70 
3.70 
0.00 
3.85 
3.85 
0.00 
3-95 
3-95 
0.00 
4.40 
4.10 
0.30 
3.00 
2.60 
0.40 
Gain or loss in weight 
of plants in grams) 
0-35 + 
0.00 
0.00 
0.00 
0.30 
0.40 
Plants with new roots and roothairs in bog water solutions, and in weak acids. 
Root growth absent in strong solutions. Absorbing surface beginning to increase in 
solution No. 4. Atmospheric conditions as in Table VIII. 
