22 BOTANICAL GAZETTE [JANUARY 
CuSO, SERIES. EXPERIMENTS TO SHOW THE EFFECT OF QUARTZ IN SOLUTION 
| | i ae 8n | n | om 
les Ge = ae, Bese ge 
| 100000 | 1000 1000 | r00o | 100 100 
artz to ae es | 
ped gran of sprou 15.35 | 11.42 6.57 3.60 3.12 
gm quartz to as solution | 
Av. length of s | 14.85 | 14.72 | 11.65 | 7.2 4.8 | 3.4 2.2 
| Beane cece 
TABLE III 
CuSO, SERIES IN SOLUTION; 500°° BOTTLES. FEBRUARY 20—-MARCH 3. 1906 
ae ee | ce eee 
H.O | | | Se acy as aati Eats ee ts | Sr aeae 
| L09000 | 75000 50000 | 25000 10000 5000 | I00c 
Average length of war CM ocges | 13.87 | 12.95 | 11.33 | 10.98 | 11.41 | 10.25 | 9.58 | 4-06 
tee green ie ding alse cla wang aia | 1296 | 1123 980 98a | -ot§ | o3r. | 825 575 
al dry weight, mg... 6......... p55. [ago | 128 13 99° 
| | 
¥a3 | 228: | 140 | 
| 
LEAD NITRATE 
In the preliminary experiment with lead nitrate from which 
fig. 6 is taken, the series runs from right to left as follows: 8/100, 
Fic. 6.—Lead nitrate series in soil. Sept. 2-14. 1905. 
Cd / ~ / 4 
7n/100, 6n/100, 5n/100, 4n/100, 32/100, 2n/100, n/100, 9/1000; 
/ 
8/1000, 7n/1000, 6n/1000, 5/1000, 4n/1000, 3n/1000, 2n/ 1000, 
/ fs fw 
n/1000, n/2500, n/5000, n/7500, n/10000, control. 
Fic. 7.—Lead nitrate series in solution. 
Sept. 10-14. 1905; 
The same concentrations, arranged in the same order, hold for 
the series in solution, fig. 7. 
es 
2. A EP LIE LEMANS IME I I 
SSS SSS TS ie se 
