Reduction of Transpiration Observations . 247 
Table II. 
Barometer 
(Mean). 
inches. 
Temperatures in 
Max. Min. 
°C. 
Mean. 
Bel. Hum. 
(Mean). 
d. 
(cm.). 
k. 
n. 
A 1 
30-19 
1 5 - 1 
14-7 
I 4 * 9 I 
56 % 
0-0 
0-0307 
i -43 
A 2 
30-14 
i 5-7 
15-0 
14*35 
73 
0-3 
0-0126 
i-6o 
A 3 
30-20 
.... 
.... 
I 9'55 
73 
o-5 
0-0187 
1-49 
A 4 
30-78 
.... 
.... 
19.85 
7 1 
o *5 
0-0168 
1-50 
A 5 
30-89 
22*5 
18.7 
20-60 
69 
o *5 
00158 
1-46 
A 6 
29-94 
i6-i 
15*3 
15*70 
74 
o -5 
0-0109 
1-62 
A 7 
29-60 
18-8 
17-7 
18-25 
70 
0-7 
O-OIOI 
1-69 
A 8 
29-77 
18-4 
17-8 
18-10 
73 
i-o 
0-0079 
1-78 
A 9 
29-60 
18-8 
17.7 
18-25 
7 o 
1-2 
0-0063 
i*86 
A 10 
29.49 
1 8-8 
18-1 
18-45 
76 
i *5 
0-0053 
1-82 
A 11 
3 o-i 3 
15-7 
15-0 
*5-35 
73 
i -5 
0-0048 
1.88 
A 12 
29.95 
1 8*7 
1 7*4 
18-05 
67 
2-0 
0-0053 
1-99 
A 13 
29-69 
19-8 
18*7 
19*25 
72 
2-5 
0-0050 
J -99 
A 14 
29*57 
20-3 
19-2 
19-75 
7 1 
2*5 
0-0056 
r -97 
A 15 
29-83 
19-0 
i 8-5 
18-75 
7 1 
3-0 
0-0049 
i -97 
B 1 
30-24 
21-7 
17-7 
19-70 
62 
o -5 
0-0291 
1-58 
B 2 
30-23 
21-7 
18-1 
19-90 
60 
o-6 
0-0268 
1.57 
B3 
30-21 
21-3 
18-3 
19-80 
66 
o-7 
0-0206 
1-65 
b 4 
29*55 
16-8 
14-7 
15-76 
90 
2*5 
0-0031 
2-00 
B 5 
29-61 
17-1 
13-9 
15-50 
84 
2*5 
0-0047 
1-98 
C 1 
30-21 
21-8 
18-9 
20-35 
68 
o -5 
0-0607 
1-67 
C 2 
29*95 
15-7 
H'7 
15-21 
78 
2-7 
0-0379 
1.77 
C 3 
2-4 
i *4 
1-9 
66 
3 *o 
0-0097 
2-06 
does the magnitude of n fall to unity — the value demanded by Stefan’s law. 
The probable reasons for this do not here concern us — these, and several 
other points of purely physical interest, we hope to be able to publish later 
through the proper channels. It is sufficient here to note the fact itself. 
Again, as the depth of the liquid surface below the rim increases, n also 
increases, rapidly at first, and then more slowly, until when d is greater than 
about 3 centimetres, n has become practically equal to 2, and the ‘ area ’ 
law holds good. 
Thirdly, if the depth remain constant, and the external circumstances 
are varied in the direction of a greater disturbance of the atmosphere, n also 
increases, but only relatively slowly. The experiment C 1, for example, was 
carried out in the open air, with a gentle breeze blowing sufficiently hard to 
ruffle continually the liquid surfaces exposed. Even under these conditions 
the value of n was no greater than 1*67. We found this result somewhat 
surprising, as we had expected, from a priori considerations, that the large 
disturbance induced in the lines of flow by a steady breeze would tend to 
make n practically equal to 2. This is, however, by no means the case, as 
indeed Stefan has indicated. 1 
We may say then that, under all ordinary circumstances, the value of n , 
for a vessel filled to within 5 millimetres of the brim, varies from 1*5 to 17 
1 Loc. cit., p. 41 1. 
S 2 
