46 
Richards. — -The Evolution of 
A. 
The experiments in this section were all made with a 
thermo-electric element attached to a galvanometer of the 
form and after the manner already described. In all cases 
the material used had been kept at least twenty-four hours 
in the warm room before being used. Hence no mention of 
this is made under the individual experiments. The readings 
of the galvanometer are given in divisions and fractions of 
divisions of the scale employed, and are corrected to the actual 
zero-point of galvanometer at the time the observations were 
made, i division of galvanometer scale = 0-07° C. 
Experiment 1. 
Two potatoes 7-8 cm. long. In uninjured condition show 
equal temperature. One cut at 4.00 p.m., the other left 
uninjured. 
Duration of Experiment. 
Temperature 
in room. 
Deflec. of 
Galvan. 
Equiv. in °C. 
First day 
4.00 p.m. 
2 4°5° 
OO 
0°-00 
„ 
6.00 „ 
24°-40 
I-I 
0°.08 
„ 
8.45 a.m. 
24°-IO 
2-7 
0°.19 
,, 
12.45 P- m - 
2 4°'3° 
4.0 
0°-28 
Second day 
4-30 j > 
2 4 0 . 30 
2-8 
0°-20 
„ 
9.30 a.m. 
24°*20 
1*2 
0°*08 
Third day 
9-30 „ 
2 4 0 . 40 
o-5 
0°*03 
Fourth day 
9-30 „ 
24°-40 
0-0 
o°.oo 
Experiment 2. 
Two potatoes 7-8 cm. long. No difference in temperature 
in uninjured state. One cut at 4.00 p.m. 
Duration of Experiment. 
Temperature 
in room. 
Deflec. of 
Galvan. 
Equiv. in °C. 
First day 
4.00 p.m. 
2 4°*5° 
0-0 
0°.00 
6.00 „ 
24 0 *4o 
I *5 
0°.09 
» 
8.30 a.m. 
24° 10 
2.7 
0°19 
„ 
12.30 p.m. 
2 4°‘3° 
4-5 
0 C .31 
Second day 
4-3o „ 
2 4 0 . 3° 
3-o 
0°21 
Third day 
9.30 a.m. 
24°*20 
o-5 
0°03 
9.30 „ 
24°.4o 
o-3 
0 o -02 
Fourth day 
9-30 „ 
2 4°*40 
0-0 
o°.oo 
