332 
Journal of Agricultural Research 
Vol. XI, No. 7 
Table III .—Permeability of tomato leaves under the influence of ether , chloroform , 
potassium cyanid, and hydrocyanic acid 
No. 
Material and treatment. 
Origi¬ 
nal 
After treat¬ 
ment. 
After exposure 
to air for one 
hour. 
Sugar test in water 
after removal of 
weight. 
Weight. 
Change 
in 
weight. 
Weight. 
Change 
in 
weight. 
leaves. 
1 
2 
Normal leaves in distilled water, 18 
hours. 
Gm. 
©•1933 
. 2077 
Gm . 
0 -1975 
. 2074 
Per ct. 
+ 2.1 
* O 
Gm. 
0 .1565 
Per ct. 
— 19.0 
36.0 
16.0 
Very faint positive. 
Do. 
Do. 
Do. 
3 
• 27 CC 
•2750 
• 1476 
• O 
* a Oj v 1 
* 2*12 
4 
.do. 
*1432 
+ 2.9 
* 1 * 
*1074 
25.0 
Average. 
+ 1.25 
— 24.0 
Do. 
5 
Normal leaves in ether water, 18 
hours. 
. i960 
. 1872 
- 4-5 
«1292 
34 *o 
Faint positive. 
6 
. 1278 
.2913 
. 1248 
• 2750 
—» 9 . T 
Do. 
Do. 
7 
O* * 
— 5.6 
• 
. 1810 
37 *o 
Average. 
— 4.4 
34 -o 
Do. 
8 
9 
Normal leaves in a solution contain¬ 
ing 2.4 mgm. of potassium cyanid 
per c. c.; 18 hours. 
.2807 
.2644 
. 2610 
*24 33 
- 7 -o 
— 8.0 
•1530 
.1478 
45 -o 
44.0 
Negative. 
Do. 
Average. 
— 7, e 
44.0 
Do. 
IO 
Normal leaf in chloroform water, 18 
hours. 
. 1408 
. 1200 
-14.7 
.0850 
— 39 -o 
Strong positive. 
11 
12 
Normal leaves in water, 22 hours.... 
. 1210 
• OOO ? 
• II 9 S 
— 1.2 
1.0 
•1075 
.0820 
. 2100 
II* I 
0. 2 
Faint positive. 
Do. 
Do. 
13 
• 2278 
• 0912 
. 2228 
— 2.2 
7 * * 
- 8.0 
Average. 
-0.8 
— O- A. 
Do. 
7 ' 
14 
Normal leaves in water containing 
. 1708 
• 0720 
•1358 
* ocoo 
—20.0 
Negative. 
Do. 
Do. 
15 
16 
0.70 mgm. of hydrocyanic acid per 
c. c.; 22 hours. 
—30.0 
—20.0 
.0280 
•0735 
61. 0 
.1148 
.0910 
36-0 
Average. 
—24.0 
“32-0 
Do. 
17 
Normal leaves in water containing 
• m2 
.0848 
.0912 
. 1010 
—23.0 
—30.0 
” 34-0 
Do. 
18 
0.35 mgm. of hydrocyanic acid per 
c. c.; 22 hours. 
• 1302 
•1543 
Do. 
19 
• 0658 
57 *o 
Do. 
Average. 
— 29.0 
-57.0 
Do. 
20 
21 
Leaves from plants fumigated one 
hour previously with 1.0 gm. of 
potassium cyanid per cubic meter, 
immersed in water 22 hours. 
.2188 
.0700 
. 1012 
>22 77 
+ 4-0 
— 18.4 
-8.3 
. 2065 
.0476 
. 0842 
5.6 
12 . O 
Faint positive. 
Do. 
Do. 
22 
* i •*■ 
.0928 
, O* w 
_16.8 
Average. 
— IO. O 
— 18.0 
Do. 
23 
Normal leaves in water 24 hours. 
• 2253 
•I 37 S 
.0831 
.0500 
•2133 
• 1335 
. 0821 
— . 5-3 
— 7.0 
Do. 
24 
25 
.do. 
Do. 
0* u 
— 1*2 
Do. 
26 
.0360 
—28.0 
Do. 
Average. 
— Q* O 
Do. 
27 
Normal leaves in water containing 
•0793 
.1250 
.0416 
.0710 
. 1141 
. 0277 
“io. 5 
Negative. 
s8 
o.iomgm. of hydrocyanic acid per 
c. c.; 24 hours. 
- 8.7 
— 33 * 4 
Do. 
29 
Do. 
Average. 
— 17. 0 
Do. 
30 
Leaves from plants fumigated one 
hour previously with 1.0 gm. of 
potassium cyanid per cubic meter 
in water 22 hours. 
•1853 
. 1167 
.0222 
• 1603 
4 1021 
— 13-0 
—12.0 
Faint positive. 
Do. 
3 i 
33 
• 0158 
— 29.0 
Do. 
Average. 
— 18.0 
Do. 
