170 H. MØLHOLM HANSEN 
TABLE 34. Annual Variations in the Temperature 
of the Air, Snow, and Soil in Sodankylå (Finland, 67° 22° N., 26° 39" E.). 
The investigations cover the period from November 1915 to October 
1917 (cf. Keränen 1920, pp. 52—53). 
- = = a uy 
IF ara “| 31 2 
thofsnowem 47.8 » || 16.11 31.9) 45.8 62.5) 70.5) 68.8 > > » > > > | 
‘ipitationmm > » || 52:61 25.8) 23.3) 33.1) 25.5) 36.4| 36.3|49.7/65.3/68.1|74.6| 75.0) 56.6 | 
SEE accep oe > » 8.2 TE, 8.1 7.7 6.31 7.9! 7.8| 69! 7.0) 8.0) 7.1) 8.31 7.6 
perature of 
AN = 12.110 6 |=8.2|= 17.7 =-14.0 15.0. +-13.6-4.1| 1.2/11.9|14.4/11.7| 4.5/=1.2]=25] 
wo em EE — 14.2 > +9.6 —18.9 —16.1 17.0 +15.145.9 + » » » > 
SN USSR » » # 2101-2102 —10.8 —10.4 —3.4 # » » > > 
UE EPP >} >| + # + 72+ 82+ 8.2+3.0 + »| »| »| à » > | 
U IR > » * # 49-63 66-26 + > > » » » | 
SA) 3, 2.00: » > » # + |= 4854 = x ” - >| 4 
-50 > » > m ae AGREE # > » ) » > » | 
60,9. oF oo. » » » 34 + # » » > > >| » | 
Far ner Sj" aaa.) 
Dienst. ee + 2.7132 428+ 4.0 — 3.3 + 28+ 2741.2 1.9/15.3 18.3 14.0 5.105 3.2 (22. 
10 > .. ..|s 19122/=11|> 25-2 2.6|< 2.1= 21-+10) -0.9/11:8116.7|13-8/. 6.5), 1.0) 320 
Be TEE + 1411.0 +04-- 1.7 2.1 17— 18-10) 04 9.3114.913.0) 7.0 14) 3.1112 
ee + 11107 04+ 12+ 18+ 16+ 16-+0.9 0.2 7.914313.1 7.7 2.2) 3.2 116 
80 .... | 0.1) 9.0) 13 0.6 0.2=+ 0.6-- 1.0-+-0.8+0.2 5.4111.811.9 8.1) 3.1) 3.2112 
EJ Her hr 0.8! 7.2| 24 1.3 0.6 0.3 0.1-—-0.1| 0.0) 1.9! 8.4110.1, 9.5 4.6) 3.2718 
ee 1211%6:6.1 22.7 127 0.9 0.6 031 0.1! 0.1! 1.5) 7.0| 9.4| 841 4.9] 3101 
snow. At the beginning of the winter when the snow lies lightly, 
a layer of a certain depth has a greater power of isolation than 
a layer of the same depth at the close of the winter, at which time 
the layer has grown more compact. Thus the table shows that the 
difference in temperature between corresponding layers is greatest 
at the beginning of a snow-period and decreases progressively until 
it attains its lowest value at the close of the winter. This fact has 
a certain practical significance in that the temperature at the surface 
of the soil will never be very much lower at the beginning of the 
winter than later on, in spite of the much slighter snow-covering at 
the beginning of the winter. 
Investigations on the temperature conditions in soil with a 
different water content, of a different consistence, and with a different 
