i 
1907] 
JENSEN—TOXIC LIMITS AND STIMULATION 31 
Unfortunately, the plate showing the condition of the plants at 
the end of the experiment—18 days growth—was spoiled. How- 
ever, by referring to Table 
X and fig. 20 which repre- 
sents this later condition, 
it will be seen that there 
is acceleration in con- 
centrations 
n/ 10000. 
In comparison 
with lead nitrate this ac- 
5n/10000 to 
19-25. 1905 
Fic. 19.—Zinc sulfate series in solution. Sept. 
celeration is in weak solutions and is not nearly as well marked as in 
the Pb(NO,),. The series in solution of ZnSO, (figs. 19, 21, and 
Nut. Sol. 
n/ 100000 ES 
n/50000} |_| 
n/'25000 a 
RiiGdoo |<) | 
3n/ 10000 }———|_| 
§n/t0000}——|_| 
7%/ 10000 a 
9n/ 10000 J 
2n/tooo}-—__1_| 
7 
4 
| 
wt 
[i iV 
Nut. Sol. “ 
i 
K 
‘ \ + Tif LQOUUY 
\ Vi 
Ai eae! 
| ~ \\ me ye \ 
ht n/asc0 AA 
i) W. 
hk ) 
] ; n/ 10000 
if Va 
; Y 3n/ 10000 ‘ 
ne 
- ; 5”/ 10000 
F i 
Y 
ri i i 
, 7n/ 109Cc0 
/ 
a 
/) 
ih 
{A 
Qn/ 10000 : 7 
5} 
ane Paes 
II: 
4n/x009}|—_ onl 
Rue, 
6n/1 Doe . EE 
12000} eed Gee cee ? . “ 2n/ 1000 % 
é 3 -. J 
8/1000 ++? f. 4n/10Co ow? meee Sa 
ry / yo Va ‘| 
n/ 100 jp} | f i 5n/ 1000 eee ES if i 
: P ss ( 
i “yr 2 . : 
since fi 6n/1000 2. we 
aa W, eo 
3n/to9 zn/ 1000 E are 
L. ors 10 15 
--L 5 ° 15 20 < 
Weime'ee To 30 50 70 mass — evs on 
—s 250 450 650 850 ret = a . 
F 30 50 7o 9° series Dae ee 
*- 20.-—Zine sulfate series in soil. Oct. 21-Nov. 18. Fic. 21.—Zinc sulfate series in solution. 
5- 
Igo 
Oct. 14-Nov. 14. 1995. 
