66 
F. STOWARD, D.SC. : 
intact tuber, briefly to refer to certain experiments in which 
the study of the induced formation of wound cork has 
formed one of the principal objects of experimentation. 
In these experiments the freshly exposed surfaces of 
the two cut sets prepared from each tuber were, immediately 
after cutting, lightly dressed with either freshly powdered 
air-slaked lime, sulphur or sand. These treated sets, and 
also untreated sets (controls) were afterwards exposed for 
144-168 hours in order to note, as in the preceding ex- 
periments, the comparative loss of weight following on 
the application of the dressing and subsequent exposure of 
the experimental material. 
Two series of experiments were thus prepared, and the 
material was finally planted in ordinary garden soil contained 
in shallow boxes, a small but uniform addition of an artificial 
potato-manure being made to each portion of soil. The 
conditions of exposure after treatment and during culture 
were similar within each separate series of four experiments ; 
the two series were not, however, contemporaneous, one 
series (series 1) being planted earlier than the other (series 2). 
The relative percentage losses of weight by “ cut sets ” 
under the various treatments are embodied in the tables 
beneath : — 
Table 11 . 
Percentage losses of weight. 
Series I. — Four lots, 5 each, white thin-skinned tubers, 
treated as under : — 
Experiment 
Sets treated with 
I 
Lime 
2 
Sulphur 
3 
Sand 
4 
Untreated 
[Control 1 
After 4 hours exposure 
i- 74 % 
i-88% 
178% 
2 - 33 °^ 
„ 8 „ 
> > 
3-94 
4.19 
3.81 
11.8 
„ 24 „ 
t } 
9.98 
13.98 
12.14 
15 1 
„ 48 „ 
,, 
15.96 
17.02 
16 -37 
23-4 
,, 9 6 
t } 
18.59 
20.03 
20.64 
— 
144 „ 
t r • - 
22.20 
23.69 
24.08 
27-3 
Series II. — Four lots, 5 each, red thick-skinned tubers, 
treated as under : — 
Table 111 . 
Percentage losses of weight. 
Experiment 
Sets treated with 
After 24 hours’ exposure 
5 
Lime 
7 - 35 % 
6 
Sulphur 
8.03% 
Sand 
8.48% 
8 
Untreated 
fControl| 
n- 9 % 
48 „ 
} t 
11.98 
13.88 
16.38 
17.91 
7 2 - 
t J 
14.99 
17.48 
19-35 
22.09 
96 „ 
• t 
16.9 
20.02 
22.74 
25.40 
» 144 
1 1 
I 9-37 
23 - 9 1 
27-03 
30- 5 1 
„ 168 „ 
it 
20.54 
25.81 
28.86 
32.41 
