Yol. XXX, No. 8 
752 
Journal of Agricultural Research 
Table XIII .—Average number of general risk fires per year, per million acres, by 
10-day periods —Continued 
REGION 19—SOUTHWESTERN COLORADO AND NORTHERN NEW MEXICO e 
Period 
Number of fires, by forest types 
Western i , 
yellow ! 
pine, ; TndPP I Crass, 
Douglas i nolo S Pinon ' brush, 
fir, U juniper sage, and 
Engel- : pme j aspen 
mann j 
spruce 1 
Mar. 
1- 
- 10 -_ 
11- 
-20_ _ 
21- 
-31.. 
Apr. 
1- 
-10. _ 
11- 
-20- 
21- 
-30- 
May 
1- 
-10- 
11- 
-20- 
21- 
-31- 
June 
1- 
-10- 
11- 
-20- 
21- 
-30_. 
July 
1- 
-10- 
11- 
-20- 
21- 
-31- 
Aug. 
1 
-10- 
11- 
-20- 
21- 
-31- 
Sept. 
1- 
-10- 
11- 
-20- 
21- 
-30- 
Oct. 
1- 
-10- 
11- 
-20- 
21- 
-31- 
Nov. 
1- 
-10- 
11- 
-20- 
21- 
-30- 
0 . 4 
0.2 _ 
. 2 _ . 4 
.3 _ .7 
.7 _ : _ 
.8 _i .7 
.4 _ 
.8 _ 
.6 0.9 .7 
.6 _ 
.1 __ 
.2 __ 
.5 __ 
. 1 
. 1 
. 2 
. 4 
. 1 
. 3 
0.3 
. 1 
. 1 
. 2 
. 1 
. 1 
. ] 
. 1 
REGION 21—LAKE STATES / 
Period 
Apr. 1-10_ 
11-20_ 
21-30_ 
May 1-10_ 
1 1-20 _ 
21-31_ 
June 1-10_ 
11-20_ 
21-30_ 
July 1-10_ 
11-20_ 
21-31_ 
Aug. 1-10_ 
11-20_ 
21-31_ 
Sept. 1-10_ 
11-20-_ 
21-30_ 
Oct. 1-10_ 
11-20_ 
21-31_ 
Danger periods A b 
Danger periods B b . 
Number of fires, by forest types 
Eastern I 
white and 
red pines 
Jack pine 
Hard¬ 
woods 
Tamarack j 
and 
balsam 
Open 
h 2 
2. 5 
13. 7 
1.5 . 
3. 7 
k 7 
13. 3 
3. 7 
. 7 
20. 0 
8. 7 I 
2. 5 
5.0 
2.5 
1. 2 
1. 2 
5. 0 
1. 2 
3.0 
2. 2 
1. 1 ; 
l- 1 
1. 5 
. 7 
1.8 
1.8 
1.1 
1.1 j 
4.3 1 
2. 2 ! 
1. 1 ! 
1. 1 
1.1 | 
I 
— 
6. 7 
6. 7 
0. 7 
0. 7 
. / 
j 
1.0 . 
% 2 
6. 7 
1. 2 
.4 
i 
_ 
1.0 . 
0. 7 
. i .. . 
0. 7 
. 4 
Apr. 1-July 
Apr. 11-30; 
May 11- 
Aug. 11-20; Apr. 11- 
31; Aug. 
1 May 11- 
July 20. 
Sept. 11- May 20; 
21 - Sepc. 
June 30; 
20. June 21- 
10. 
July 11- 
July 20; 
20; Aug. 
• Aug. 21- 
1-10. 
Sept. 10; 
Oct. 1-10. 
Apr. 21- 
Apr. 21- 
June 1-10. 
None. Same as 
May 20; 
30; May 
A. 
June 1-10; 
11-20. 
July 11- 
20. 
b Danger periods A are the periods during which one or more than one fire occurs in 10 days. Danger 
periods B are the periods within which three or more fires occur in 10 days, or two fires or more a week. 
« No danger periods occurred in this region; that is to say, the average per 10 days was always less than 
one fire. 
/ Data on areas of all types very unsatisfactory; figures for numbers of fires in “open” probably much 
too high. 
