20 +. Loomis— Observations of the U. S. Signal Service. 
temperature at Iceland was at least 2 degrees Fahrenheit (one 
degree Reaumur) above the mean, and the year is shown in 
) 
at Vienna for the same month was above or below the mean. 
Temperature of Iceland and Vienna compared. 
NoOvEMBER. DECEMBER. JANUARY. 
Ieeland.| Vienna. Teeland. | Vienna TIeeland. Vienna. 
1827 | +5°1)—7°1 || 1826 | +2°°6/+4 4°-3]| 1823 |4+4°°1 |—20°-2 
32 “| —3" 28 2 ne 28 6 [+ 0° 
51| 29/—45 || 34| 612l+aal| 33| 32 |— 75 
es ee ol] 35| 2g9\|—40|]| 47] 99 |— 37 
57 —35 || 49 | 60 \|— 3-4|| 48] 2-5 |—11-0 
s8| 25/—81 || 50] 5914+ O71] sr| 65/4 09 
64 3}—18 || 51| tol+ o1|} 61] 53 |— 3-6 
6 | 36i—i8 1 63. 62 \|— sail -62| 39 \|— 1-6 
70| a7}4+48 {| 58| 2914+ o9l| 64! 3-4 |— 9-0 
: 61 | 35 |— 2 69 | 51 |— 0-2 
cis.) OP ia ce 30 |— 66|| 70 | 29/4 0-4 
ki 38 + 1) Mean | 444 | 4% 
m1 | 3-4 |—104 
1827 | +5-1 | —7-1 || Mean | +42 | —2°3 
29 Bid | mm omen, 
$01] 7 823 | +41 |—10-2 
32 | 42-7 | 31 | 1829 | +41 |—13-4]| 26 |—o-4 2 
36]. 80\| 3 0-6 O}} 29}423] 37 
46 | + 3:8 35 | +2°9 0 301.4431 119 * 
ai |—2-7|} 28/|| 46|409| 331] 31/406] 3 
49 |—02) 2-7 49\450} 3-41) 33|437} TS 
61/429] 45 53 g4|| 471499) 37 
63/412] 25 55 1+091 10°8|| 48/4251 11-0 
54|—06| 3°6 59 | —6-0 50 | 41-4 
56|—o07| 63 611435] a7]| 68/407] 34 
57 | +53 36 | 64/430] etl] 61} +453 
58 | 425] 81 70\4+21| B4il. 64143841 9-0 
60 | +1°8 33 | m11434!] lo1|| 71/4126| 61 
Mean | +1-9 | —4°8 || Mean | +2°0 | —6-4|| Mean | +30 | —6-7 
It will be seen that for the years here named, the average te 
perature of Iceland in November was 3-7 degrees (Fahrenheit) 
my the mean, while that of Vienna was 3-4 d below the 
ean; and for the three months compared, the temperature of 
Teeland was 4°1 degrees above the mean, while that of Vienna 
for the same months was 3°5 degrees below the mean. Now if the 
temperature of Vienna were independent of the causes which 
affect the temperature at Iceland, the average departure from the 
mean temperature at Vienna for the months in question should 
be zero, instead of whi ch we find the value 8°5 degrees. 
In the lower half of the table, column third contains all a 
eases in which the temperature at Vienna was at least 2 
