Table III. 
1918-19.] 
The Cooling of the Soil at Night, 
129 
Remarks. 
Nights when 
surface tempera- 
L ture was below 
freezing-point 
almost all night. 
■\ 
Nights when 
surface tempera- 
l ture was above 
freezing-point 
almost all night. 
j 
7 
Difference, 
cols. 5 and 6. 
Calories. 
o 
p jr- cp p p p oo 7 f<< ? ( ? q o 9 ® 
X w jq 6 w ib (ii 9* bo co 9 h - 9 ho 
1 +I++II 1 J 1 1 +1 
6 
Radiation. 
Calories. 
cp ipo 99 
05 X 6 6 05 L X 9 * O 05 X 006 
CM CM CO CO O O ' CM O O CO 05 
5 
Total calories 
to balance 
radiation. 
I>- CM CM O 1— 1 N © O CM 
X X bo X cm cb X cb X <b X cm 65 
CM CM CM W h H O CM 05 O CM C3000 
4 
Cooling of 
surface 
layers. 
Calories. 
^ r^HCMCMOOp O CM O O Or* 
10 X 65 co X 65 X cm X cm cm bo 9 * 
—1 I— 1 r-H CM CM CM CM H CM 
3 
Latent heat 
liberated on 
surface 
freezing. 
Calories. 
p cp 0 qo oc cq p p . . . 09 
cm X cm cm X 65 cm X::: zo io 
t'- aor^oocor-r^ cm coco 
2 
Conduction 
upward. 
Calories. 
O cpppcppp c» 00 p^ p co 
O X X 65 <x> bo »b cb cm X cm ooqo 
*0 CM CO CO CM CM NNQOO CM CM 
rH 
1 
Date. 
1918. 
November 22 ... 
1919. 
January 19 . 
February 8 . 
,, 9 
„ 24 
March 3 .... 
» 4 
1918. 
November 13 , 
December 4 . 
„ 8 
„ 15 
1919. 
February 27 . . 
March 2 
VOL. XXXIX, 
9 
