1907] JENSEN—TOXIC LIMITS AND STIMULATION 37 
XVI and XVIII are the averages of three sets of experiments, the 
results of which are plotted ia jigs. 29, 30. 
H,0 i. % 
\h 
HO 3n/ 10000000 =. 
2 ws, 
\ NA 4 ; \. 
“s 4nh/ LOQOS00Co 
n/ 10000 “ae 5 
\ \ Y On / 10000000 igi 
n/ 4000 - ce Ae 
. a 
\ y, 8n/ 10000000 
n/2000 1 b 
Botte 4 
DO a a n/ 100000 v* 
n/ 1000 -_ 4: if "4 
Ye 2 1/ 190000 ar 
2n/ 000 4 CA ie 
/ ‘ 
” an/ 00000 i 
U/) 4 ; 
3n/ 1000 bol | 
/ 6n/ 100000 ! 
4N/ Looo f / 
4 VW 8n/ 100000 ; 
52/1000 AL/ : 
7Y, poee 
6/1000 t i 
eel, 5 ro 15 20 n/ 4000 
Sete 1S 25 35 45 5 10 15 
nis pr eene 1090 300 500 FO a ere 750 aie 1550 
ae 60 80 100 —*+— 105 145 185 
al Plog nitrate series in soil. Mar. Fic. 30.—Nickel nitrate series 
rrp in solution. Mar. 29-Apr. 8. 
1906. 
TABLE XVI 
N1(NO;)2 SERIES IN SOIL. MARCH 17~APRIL 2, 1906 
H.O n n n n 2m 3n | 4n | 5 | On 
*™" | x0000} 4000 | 2 I I tooo | 1000 | 1000 | 1000 | 1000 
Av. length a ees 
Total Perea Sprout, cm., ,| 14.16] 15.40 | 15.94| 16.50| 15.29 | 10.30 7.30) § 30| Dead 
Total penal ny gm....|39.3 | 41.7 | 42.8 | 43.6 | 29.4 | 23-1 [2.0 |19.7 |17.4 |17-3 
Total dry weight, mg..../ 574 |. 685 | 696 518 | 200 | 185 | 160 
Weight, mg...... 84 95 102 82 a0 
TABLE XVII 
Ni(NO;)2 SERIES IN SOLUTION. MArcH 29-APRIL 8, 1906 
Sn n 
Av. length 
Potslorwen uci 11.35 3! II.40 Il.55 II.20 9-95 
green weight, mg........ I I 1535 1490 1180 1060 
otal dry weight, mg...._... |, er eg 8 170 146 140 
