Heat by Wounded Plants. 
5i 
Experiment 11 . 
To determine the distance at which the increase of tem- 
perature may be noticed. Two potatoes, one of which was 
cut in the usual way, were kept until the injured one had 
attained its maximum temperature. 
Deflec. of 
Galvan. 
Equiv. in 
Celsius 0 
Tempera- 
ture 
in room. 
In wound 
3 -o 
0-21 
2 4 °. 3 ° 
5 mm. distant 
1.8 
0-11 
11 mm. ,, 
1-0 
0-07 
15 mm. „ 
0.7 
0-05 
20 mm. ,, 
0-0 
000 
Experiment 12 . 
For the same purpose as Experiment 11. Potatoes treated 
in the same way. 
Deflec. of 
Galvan. 
Equiv. in 
Celsius ° 
Tempera- 
ture 
in room. 
In wound 
3 *o 
0-21 
24°' 30 
o*5 mm. distant 
2-2 
015 
3.5 mm. „ 
2-0 
0-14 
8*o mm. „ 
1.8 
0-13 
i*o mm. ,, 
1.6 
0.11 
1.3 mm. „ 
1-0 
0-07 
1.7 mm. „ 
0-5 
0-03 
Experiment 12 #. 
To determine the effect of exclusion of air from the wounded 
parts. Two potatoes, one of which was cut and the cuts 
immediately pressed together and covered with clay. No 
deflection of the galvanometer was observed immediately 
subsequent to injury. After standing twenty-four hours clay 
removed and determination made. 
Temperature 
in room. 
Deflec. of 
Galvan. 
Equiv. 
in °C. 
July 20. 9.00 a.m. 
24.30 
1-0 
0*07 
,, 1 2.00 noon 
24-35 
1-7 
0*12 
„ 5.00 p.m. 
24.30 
2.4 
0.17 
E 2 
