1907] JENSEN—TOXIC LIMITS AND STIMULATION 39 
These results are shown graphically in figs. 31, 32. 
H.0 HO 
n/ 
n 
vi 
t/ T0000 1 \ n/ 10000 : 
\\ i 
2n/ 0000 2n/ 10000 
\ \ 
4n/ 10000 aes / 
: ; 4n/ 10000 : 
- Ne J 
sa \. Pf 
6n/ 10000 ] 6n/ 10000 Ve 
82/ 10000 + 4 i a i A 
/ \ : 82/ 10000 7g 
n/ 1000 z=: si. 
is ; n/ To0o0 Ps 
2n/1000|———] | : if ‘ vy; i 
/1000|_ — 7 
4N/ 1000 7 F | 4n/ 1500 
J 
/ i/ On/ LOOO / g 
y f 3 
8/1000 H+—— it J : 
n/ 100 
2n/too La / di 
os eee 2n/1o0o 
eae 5 Io 15 Z 190 15 
ice: = ro 20 30 40 50 60 eee es 409° 800 1200 
* —~I00 I900 300 500 700 —--— 80 120 160 
ea ee eS RS Cae ee xs 
- 31-—Phenol series in soil. Mar. 
Fic Fic. 32.—Phenol series in solution. 
17~Apr. 2. 1906. . 
Mar. 8-22. 1 
ALCOHOL 
Ethyl alcohol is less poisonous than anything thus far tried. 
Plants endure concentrations up to 50n/100 or 75”/100 and are 
Most actively stimulated by 75”/1000 to 25/1000 in both solution 
and soil. In the case of alcohol and phenol, therefore, the absorp- 
toa of poison by quartz is practically a negligible quantity. Tables 
XX, XXI, and figs. 33, 34 show acceleration in soil at 75/1000 and 
in solution at 50n / IO00. 
TABLE XX 
ALCOHOL SERIES IN SOIL. MARCH 2-22. 1906. 
H.O | Zo" | 25m | som | 75” 25m | som | 75” " 
er | . I 1000 1000 1090 100 100 ae! 
Av. length of 6 
T, t Sprout. cm.....|19.02 |18.92 |19. 19.02 |20.64 £5.48 (72-14) 6.10 | 3-44 
Total transpiration, gm... 38.80 37-80 |37 4 38.70 |40.30 a i eg ee 
Total rn eeMt. mg ..... 690 | 640 | 649 | 661 | 765 <i Peayooka Hot 
96 | 92 | of | 100 | 115 a ae 
weight, mg....... 
