36 BOTANICAL GAZETTE [JANUARY 
IRON CHLORID 
Experiments with Fe,Cl, were carried out in order to compare 
with Fe,(NO,),. It was found that plants die in the same concen- 
tratioa, and growth is accelerated ia equal proportion by the same 
concentrations in either solution, as is shown in the Table XV. 
Nut. Sol. aS 
Ny 
KR 
n/'7500 me 
XIN : 
aay SY } 
n/ 2500 1e ' 
dy 
3n/ 1000 oul ) 
a 
4n/ 1000 ae 
a oe , 
4n/ 1000 — a ye 
A a 
8n/100 fc a va 
7 - 
nt. man rose ‘2 
. : A 
z : 
ae ! : YA 
toms 4090 
ae Z 
52/100 
15 20 25 
os 20 30 4° 
pueoee 300 1300 1800 
ra 70 1I0 130 
Fic. 28.—TIron nitrate series in nutritive 
solution. Oct. 14—Nov. 1. 1905. 
ABLE XV 
FE,CL6 SERIES IN SOIL. NOVEMBER 12-DECEMBER 12, 1905 
———— 
3n 4n 6n ™m 8n on n on | 38 | & 
n 
H.0 fore) 
1000 | 1000 | 1000 | 1000 | 1000 | 1009 | 1000 | 1000] 100 | I 
Av. length of sprout, cm.| 19.32 | 19.38 | 21.80 | 19.64 | 16.60| 13.38| 10.22! 9.86! 9.68| 9.06| 6.60] 4- cen 
Total transpiration, gm.| 85.30 | 75.80| 78.10] 62.9 | 41.10 36.40 | 27.70 | 29.20 | 29.10 | 29.10 | 30. 70 | 24-9° mae 
Total green weight, mg.| 787 845 835 652 490 450 | 235 205 188 119 4 35 6 
Total dry weight, mg..| 130 i 4 40 5 15 
NICKEL NITRATE 
In nickel nitrate cultures is shown the most remarkable reduction 
of toxicity by the introduction of the quartz. Thus, in soil, plants 
die in concentrations 7n/2000 to 6n/4000, while in solution death 
occurs at m/2000 to n/4o00. Stimulatioa effects are most marked 
in soil at 2/2000 to /10000, but in solution at 4n/ 10,000,000 Tables 
