ECONOMIC GEOLOGY. 59 
Table 4. — Daily rainfall, in inches, at stations in Fairbanks district, 1901 Con. 
May. 
June. 
July. 
August. 
September. 
Pay. 
oj 
| 
CO 
M 
C 
o3 
'3 
6 
I 
M 
a 
o3 
1 
M 
'3 
a; 

w 
1 

a 
s 
w 
6 
u 
a? 
£■3 
03 
6 
be 
S3 
3 
.a 
'3 
a; 

w 
O 
M 
1 
a 
gq 
>> 
S3 
6 
u 
a 
<D 
a 
IS 
CO 
o3 
,d 
O 
u 
o3 
<0 
a 
O 
| 
a; 
M 
a 
(1 
'3 
- 
OJ 
6 
u 
S3 
a 
5o 
o3 ^ 
J2 a; 
%m 
"3 
,4 

18 
0.02 
0.09 
0.24 
.13 
0. 15 
0.35 
0.12 
0. 05 
0.07 
0.01 
19 ... 
20 ... 
.14 
.13 
6.19" 
.04 
.20 
.13 
.03 
'."io 
.11 
.09 
.13 
".'l3' 
.02 
.13 
.04 
.15 
".'is' 
""is" 
.36 
.03 
0. 15 
.15 
.16 
. 37 
0. 1 1 
"."52' 
.23 
40 
21 .. 
.13 
22 
.01 
.05 
.27 
23 
.15 
24 
.25 
.18 
.05 
.22 
.15 
.02 
.27 
.23 
25 ... 
.12 
26... 
.12 
.07 
"'.'o<V 
.12 
.31 
27 
28 
""."i:V 
.01 
.23 
.30 
".12 
'.'uV 
'".iij" 
.26 
.13 
""."22" 
.02 
.15 
.09 
.54 
.13 
29 
30 
.39 
.30 
Total 
. 35 
1.47 
1.51 
2.71 
2.55 
1.87 
1.81 
3.27 
2.88 
3.00 
3.82 
3.70 
Table 
-Monthly precipitation, in inches, at stations in drainage basin of 
Tanana River, 1907. 
Jan.« 
Feb.a 
Mar.a 
Apr.a 
May. 
June. 
July. 
Aug. 
2.88 
Sept. 
Cleary 
2.55 
3.82 
3.70 
Chatanika River, near Faith Creek 
1.87 
1.51 
2.71 
3.00 
L81 
3.27 
3.30 
0.86 
2.42 
0.03 
0.35 
1.47 
Summit Road House 
1.8 
.10 
....... 
.40 
.80 
2.15 
" Records for Ihese months are px*actically 10 per cent of snowfall. 
Table (». — Monthly precipitation, in inches, at stations in drainage basin of 
Yukon River, 1907. 
Jan.o 
Feb.a 
Mar." 
Apr." May. 
June. 
July. 
Aug. 
Sepl 
1.04 
1.02 
1.45 
1.26 
2. 08 
.12 
. 69 
1.17 
0. 42 
.57 
.20 
.21 
. 55 
.20 
.28 
.44 
2. 57 
.28 
0.0 
.53 
4.49 
.27 
.27 
1.17 
0.93 
.15 
.15 
0.0 
Tr.' 
Tr. 
.02 
0.57 
2. 29 
.40 
.30 
i.3" 
1 ::i 
. 11 
2.21 
"i.*89" 
"2.95" 
2. 03 
1 . 92 
1.64 
1.40 
1.36 
1. is 
2. 58 
3. 73 
1.60 
1.57 
2.29 
Circle 
2. 79 
1 . 98 
2. 31 
5.39 
2. 1 1 
::. L9 
3. 38 
1.7;; 
Fort Egbert (Eagle) 
F( >rt Gibbon 
2. 32 
Holy Cross Mission 
North Fork 
2.0 
Rampart 
"Records for these mouths are practically 1<» per rent of snowfall. 
SALCHA REGION. 
The area drained by streams in the southeastern part of the Fair- 
hanks quadrangle has been under investigation by prospectors for 
several years. The bed rock throughout this region consists essentially 
