“I 
1907] JENSEN—TOXIC LIMITS AND STIMULATION 2 
all elongation is inhibited in concentrations up to 42/100, and from 
4n/too to n/tooo there is a slight. elongation, with considerable 
Fic. 14.—Silver nitrate series in soil. Sept. 10-15. 1905. 
broadening of the leaves. In concentrations from m/t000 to n/10000 
elongation increases. That actual acceleration might be definitely 
Fic. 15.—Silver nitrate series in solution. Sept. 10-22. 1905. 
shown, however, another series with solutions more dilute was grown. 
In this the series runs as follows: m/10000, m/25000, /50000, 
Sept. 10-15. 1905. 
Fic. 16.—Silver nitrate series in solution. 
N/10Q0000, control. <A definite region of acceleration is shown in 
hg. 17, which represents the results obtained w ith these very dilute 
Solutions. See also Table VII. 
TABLE VI 
AGNO, SERIES IN SOLUTION. FEBRUARY I9-MARCH 4. 1900 
noms taermceeee : Qa 
So ae 
U n m t 3 
0 50 2 500: COOK 
ie) ee 100000 75000 50000 25000 19000 
Be es es I Oe 20 
Tene ngth of sprout, cm....... 9.25 0.51 10.76 11.16 7-33 3-73 
T ] green weight, oe ae Sigs Soe 065 08 837 572 
otal dry w REDS, ig oo: 109 en 117 ‘ an 84 
