1907] JENSEN—TOXIC LIMITS AND STIMULATION 35 
; it is also clear, that no very marked stimulation above control, at 
extreme right, is perceptible. In jig. 23, which is the same series 
photographed when twelve days old, plants ia pots from n/r1o to 
5n/t00 are dead, and the region of active stimulation is quite evident, 
lying at 9n/1000 to 3n/1000. In jigs. 24, 25 the same thing: is 
illustrated for the water cultures with Fe,(NO,).¢ at the same ages 
as in jigs. 22, 23. Tables XII and XII give comparative results 
with and without nutrient media ia the soil. The same is graphi- 
cally shown in curves figs. 26, 2%. 
TABLE XII 
FE.(NO3)6 SERIES IN SOIL WITH NUTRIENT SOLUTION. OCTOBER 14- 
OVEMBER 8, 1905 
Nut. n n n n n 3n 5” 7" 
sol toooo | 7500 | 5000 | 2500 | 1000 | 1000 | Too | Toco 
e. length of sprout,cm..| 2r.10 | 21.16 | 21.52 | 22.62 | 22.60 | 23.5 +? te 23-5. | 22-7 
Tolal transpiration, gm. . 67.6 68.8 70.7 72.8 68.6 70.5 78.7 80.9 | 68.6 
on » nn weight, mg... 045 002 905 o14 1019 ToIg 1202 1217 1098 
otal dry weight, mg....-| ‘or 95. 08 09 IoI 112 118 123 10 
abd “ad i Hao a Rite bn i. 
1000 fee] 190 100 100 100 100 100 
dength of t 21.6 I 8 
E SPROUG CH. <5 nisin. F 7:0 | Sa Te eae 4 9-5 +3 
Tost Pirafion, gm........... 65.7 | 36.0 | 28.4 | 26.1 | 23.1 | 19.0 | 18.3 | 18.1 
Total Weight, Mg... ced 087 520 301 310 223 145 135 64 
_ Weight mec. oi. o 80 67 65 3 41 36 17 
F TABLE XIII 
.(NO;)6 sERrEs IN SOIL WITHOUT NUTRIENT SOLUTION. OCTOBER 29~NOVEMBER 24, 1905 
Ho} US| | Se ae Se eT ee eS Sie 
Sea if Too0o Btee's) 1000 1000 100 190 100 1900 100 100 100 
Av. length of a 
Total tran RwOuL, Cay... 21.98 | 22,60} 22-84 |-2>, 23.12 | 22.04 | 20.06 | 18.44] 15.90 | 12.90 | 11.36 10.94 10.38 
Total grees ration, gm... 70.8 | 72.2 eae 3.5 a 70.2 | 40.6 | 30.8 | 26.8 | 23.2 | 18.6 [17.0 [17. 
Total dry weigh ht, mg...| 855 | ‘ro80 | ‘1180 1230 | 1183 | 1133 | 775 | 425 | 310 | 245 | 165 | 150 | 133 
mg.....1 8 | rz0 | as | x22 | x19 | 114 | 95 | 70 | 58 | s2 | 40 | 38 | 38 
TABLE XIV 
FE.(NO;)¢ SERIES IN SOLUTION WITH NUTRIENT SOLUTION. OCTOBER 14- 
NOVEMBER I, 1905 
Nut n n 3n qe} oe | 8 | se | se 
{ee Sol. | 3500 | 2500 | 1000 | 1000 | 1000 | 1000 | I00 | 1 10° 
Av. length of 
i Sprout, cm.....) 2.5 | 2 26.1 | 25.0 | 22.4 19-1 | 16.5 | 14-1 | 12.4 
aac! transpiration, gm.....1 30.6 4 : 37.2 | 35-6 | 33-3 | 31-5 | 25 8 | 22.6} 21.8 yon 
Total ae weight, mg... .. at 1500 | 1657 | 13 1040 468 | 306 | 305 | 3 
weight, mg....... 109 120 126 | 112 102 81 73 71 7O 
