24 BOTANICAL GAZETTE [JANUARY 
Acceleration is not evident in nearly as marked a degree as in soil, 
however, and is not evident in nearly as concentrated solutions. 
Hence, while no appreciable change in the killing strength is made 
evident by the presence of quartz, a very marked change has occurred 
with respect to acceleration. In solution acceleration occurs at 
n/5000 to n/ 10000. 
H.0 ~ i H.O a im 
: \ can 
1/10 x, + n/ 10000 ‘ 4 i 14 
n/ 190000 uy j | ie 
t ‘A 
n [5 + n/ 000 a A \ 
\ \\ a A 
n/ 1000 ~ N + n/ 1000 a 
i IN 
ny een be \ ine SAVIN 
2n/100 +t 2n, ga oe 
S:! \ — = 
3n/ 1000 ‘ 3n/ 1000 - r 
* \ 
5n/ 1000 \ 5/1000 = 
NN if 
5 
] n/ 1000 Vi 4n/ 1000 7 
‘! y 
on/ 1000 - FH gn/ 1000 ; 
LN 4 
n/ 100 es yi n/t00 7 a 
ee 3=—- ee 
ae Pp oe 
Pe 7 i - oP or 
g n/ a ee t 3gn/ Io es Z yee 
fe | A i / 
4n/t00 L 4n/100 21 £ 
in 10 15 20 25 10 15 20 B= 
-— 10 50 70 --- 20 50 80 
totes 200 450 700 950 T2000 ttreee 300 7 sabes ee 
Fic. 9.—Lead nitrate series in soil. Feb. 2-19. 1906. Fic. 10.—Lead nitrate series in soil. Apr. 10-27: 1906 
TABLE IV 
Pp(NO;)2 SERIES IN SOIL. AVERAGE OF THREE EXPERIMENTS oo 
n 4h 
H.O n n n 2n 3n 5” on on n an Lid po 
i oe eee oe tty MeV adi (optic 
IoG00 | 5000 | 1000 | 1000 | I000 | 1000 | Io000 | 1000 100 100 100 
= nt a — cm.| 16.61 | 7.87 | 17.91 | 19.46 | 20.26} 21.15 | 21.54 | 23.18 | 21.61 | 19.34| 12.21 8.31 io 
m, gM.| 48.90 | 52.77 | 55.83 | 62.57 | 72.30| 71 40 | 81.80 | 87.60 | 65.06 | 55.60 | 17-47 | 14-33) "gn 
Total pie goer mg. 628 | 682 | 688 6 | gso | 1100 | 1125 | 1173 | © 4 | 336 | 295 “8 
Total dry weight, mg 97 | 105 | 110 | 317 | 134 | 135 rec | 449 |: ‘40 | x30 63 47 
