14 
of humidity at the basal stations. We have, however, one 
station at Numadzu on the base of the southern flank and 
another station at Kofu on the north, where observations on 
humidity are made. The observations made at these two stations 
will answer for the present investigation. We may appro- 
ximately calculate the absolute humidity at the altitude of 
1000m. on the northern flank of Mt. Fuji from that of the Kofu 
station ; and the absolute humidity of the southern flank, from 
that of the Numadzu station. Hann’s formula will answer well 
for this purpose. h 
Formula I. e h = e o 10 
6500 
••• log e A = log e 0 - 
6500 
where e A denotes the vapour tension at any altitude and e 0 denotes the known vapour 
tension observed at the base station of a mountain; h represents the difference between the 
height of a point and that of the base station, measured in meters. 
Let us require the tension at the altitude of 1000m. ou 
both flanks, north and south. The following table shows the 
mean annual and monthly temperatures for the two stations; the 
observations cover the space of five years, 1896-1900 inclusive, 
and the readings are mede six times a day. 
Tab. VII. (Temperature.) 
^Months 
Stations''''''-. 
Jan. 
Feb. 
Mar. 
Apr. 
May. 
Jun. 
Jul. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
Anu’l 
Kofu 
1.1 
2.5 
6.1 
12.48 
17.16 
20.88 
24.58 
25.72 
21.32 
14.38 
9.18 
3.52 
13.27 
Numadzu 
5.3 6.7 
8.3 
13.5 
17.8 
20.7 
24.4 
26.2 
22.4 
16.7 
12.3 
7.7 
15.1 
Calc. U 
"Altitude of Kofu = 269m. .\ h of the northern flank 
= 1000m — 269m = 731m. 
, of Numadzu = 10m. li of the southern flank 
= 1000m — 10m = 990m. 
From Tables VII., V. and Calc. I., we get the following 
table for the mean monthly and annual temperatures at the 
altitude of 1000m. on both northern and southern flanks. 
