135 
1918-19.] The Cooling of the Soil at Night. 
insolation started its temperature rose rapidly, often standing at about 
40° F. when the open soil was still at 32° F. 
Table VII. — Evaporation. 
Date. 
Air just 
over soil 
minimum. 
Open soil 
minimum. 
Sheltered 
soil 
minimum. 
Difference 
in favour 
of shelter. 
Weather. 
1918. 
December 28 
37-0 
35*5 
38-0 
2*5 
Overcast, windy 
1919. 
January 10 
36-5 
345 
37*5 
3-0 
99 
>> 
„ 26 . . 
32-0 
31-5 
34*5 
3*0 
99 
„ 31 . 
33-0 
320 
35-0 
3-0 
99 
February 1 
35*0 
335 
37-0 
35 
99 
» 
„ 7 . . 
32-0 
30-0 
33*0 
3-0 
99 
„ 18 . . 
26*0 
29*0 
32-0 
3-0 
99 
55 
March 1 
38-0 
36-0 
38-0 
2-0 
99 
55 
„ 8 . . 
32-0 
31*0 
34-0 
3-0 
99 
»» 
„ io . 
35-0 
34-0 
l 
38-0 
4-0 
99 
55 
Average difference in favour of shelter, 3*0° F. 
Table VIII. — Gold Precipitation. 
Date. 
Air just 
over soil 
minimum. 
Open soil 
minimum. 
Sheltered 
soil 
minimum. 
Difference 
in favour 
of shelter. 
Weather. 
1918. 
December 30 . 
30-0 
32-0 
35-0 
3*0 
Cold rain 
1919. 
January 2 . 
32-0 
33-0 
35-0 
2-0 
99 
99 
16 . 
31-5 
31-5 
35-0 
35 
99 
99 
21 . 
34-0 
34-0 
375 
35 
99 
22 . 
32'0 
33 0 
36*0 
3*0 
99 
24 . 
35*0 
350 
38-0 
3 0 
99 
27 . 
31-0 
30*0 
34-0 
4-0 
Snow 
99 
28 . 
27-0 
29-5 
32-5 
3-0 
99 
99 
29 . 
30-0 
31-5 
33*5 
2-0 
9 j 
February 2 . 
32-0 
325 
35-0 
2-5 
Sleet and rain 
» 
4 . 
31-0 
30-0 
330 
30 
Snow 
55 
16 . 
330 
33-0 
35*0 
2-0 
Cold rain 
55 
22 . 
35-0 
35 '0 
40*0 
5-0 
Sleet 
55 
26 . 
34*0 
34-0 
37-0 
3-0 
99 
55 
27 . 
31-0 
32-0 
35-0 
3*0 
March 
7 . 
30-0 
31-0 
34-0 
3-0 
Snow 
Average difference in favour of shelter, 3T° F. 
(4) Two geranium plants weathered the winter under the shelter ; those 
in the open were killed by frost in December. 
