Yol. XXX, No. 8 
754 Journal of Agricultural Research 
Table XIV .—Comparison of areas on which fires were attacked within 12 hours of 
discovery and those on which attack was later 
Acreage of timber fires <* by time of Acreage of woodland and open fires by 
attack time of attack 
Kegion 
Attack 
within 
12 hours 
! Attack 
1 after 
, 12 hours 
Total 
burned 
Percent¬ 
age after 
12 hours 
Attack 
within 
12 hours 
Attack 
after 
12 hours 
Total 
burned 
Per cent- 
age after 
12 hours 
Acres 
Acres 
Acres 
Per cent 
A cres 
Acres 
Acres 
Per cent 
1_ 
3, 975 
94 
4, 069 
2 
788 
10 
798 
1 
2_ 
13,316 
7, 659 
20, 975 
37 
600 
0 
600 
0 
3_ 
8, 837 
5, 386 
14, 223 
38 
73 
83 
156 
53 
4_ 
f) _ 
8, 871 
8, 272 
17,477 
22, 655 
15, 724 
31, 526 
23, 996 
24, 631 
72 
66 
4,160 
4, 940 
9, 100 
54 
6_ 
7, 154 
29 
22, 274 
7, 573 
29, 847 
25 
7__ _ — 
6, 940 
12,168 
19, 108 
64 
11,295 
0 
11,295 
0 
8_ 
8, 961 
27, 264 
36, 225 
75 
2, 948 
4, 600 
7, 548 
61 
9_ 
5, 901 
813 
6, 714 
12 
3, 894 
161 
4, 055 
4 
10_ 
6, 083 
1,471 
7, 554 
19 
12, 438 
7, 968 
20, 406 
39 
11_ 
26, 657 
827 
27, 484 
3 
2, 506 
200 
2, 706 
7 
12_ 
1,484 
0 
1,484 
0 
96 
20 
116 
17 
13_ 
2, 602 
451 
3, 053 
15 
1,566 
361 
1,927 
19 
14_ 1 
21 
80 
101 
79 
1,070 
1, 282 
2, 352 
54 
15_ 
487 
153 
640 
24 
12, 706 
60 
12, 766 
0 
16_ 
29,084 
4, 565 
33, 649 
14 
67, 567 
10, 281 
77, 848 
13 
17_ 
6, 228 
590 
6,818 
9 
147, 539 
6,617 
154, 156 
4 
18_ 
17, 294 
32, 090 
49, 384 
65 
8,578 
87 
8, 665 
1 
19_ 
3, 058 
648 
3, 706 
17 
2, 287 
0 
2, 287 
0 
20_ 
8,514 
670 
9, 184 
7 
8, 893 
555 
9, 448 
6 
21_ 
(0 
( h ) 
( b ) 
( fc ) 
66, 593 
15, 149 
81, 742 
19 
Total_ 
184, 062 
140, 462 
324, 524 j 
43 
377, 871 
59, 947 
437,818 
14 
a Including subalpine type. 
b Included in open. 
Table XV .—Number of fires by elapsed time groups, for general risk fires in all 
types 
Fires by hours elapsed from discovery to start of suppression work 
Total 
Region 
: num- 
! ber of 
i fires 
1 
Less 
than 
1 
t 
! 1 to 2 
! 
2 to 3 
3 to 4 
4 to 5 
! 
J 5 to 6 
6 to 7 
1 
7 to 8 
8 to 9 
9 to 10 
1 
j 10 to 
15 
15 to 
20 
More 
than 
20 
1_ 
42 
15 
9 
2 
2 
I 
2 
1 
1 1 
1 
2 
2 
2 
2 
2 
2_- 
337 
104 
; 58 
17 
17 
24 
14 
6 
12 
' 13 
10 
16 
19 
27 
3_ 
588 
174 
: 62 
47 
17 
19 
11 
9 
j 
23 
12 
68 
44 
83 
4_ 
330 
197 
| 29 
15 
8 
4 
5 
4 
7 
4 
7 
18 
13 
19 
5 - 
83 
31 
4 
6 
2 
4 
2 
1 
4 
1 
8 
8 
12 
6_ 
1,499 
447 
i 251 
183 
112 
75 
51 
58 
38 
44 
24 
106 
56 
54 
7_ 
: 828 
285 
129 
75 
41 
50 
33 
20 
16 
15 
23 
61 
47 
33 
8_ 
1 465 ! 
130 
57 
45 
36 
20 
17 
14 
18 
6 
19 
35 
31 
37 
9 
1 116 ! 
51 
19 j 
8 
7 
4 
4 
3 
3 
3 
3 
t i 
4 
10_ 
131 ! 
51 
16 
7 
16 
6 
6 
4 
3 
1 
1 
8 
3 
9 
11_ 
434 ! 
211 
90 ! 
47 
21 
15 
9 
10 
8 
2 
2 
12 
i 
1 
12_ 
I 108 1 
71 
9 
6 
6 
3 
2 
1 
2 
1 
2 
2 
— 
13_ 
108 { 
56 
19 i 
6 , 
8 
3 
i 
2 
4 
1 
1 
2 
1 
4 
14 _ 
15 _ 
25 1 
73 ! 
11 1 
27 ! 
6 
2 ! 
2 
; 1 J 
1 1 
2 
12 
12 ! 
3 
4 ; 
2 
1 
3 
1 
4 
1 
i" 
2 
16 _ 
1,385 1 
669 
223 
135 
79 
52 1 
20 
25 
15 
17 
20 
77 i 
27 
26 
17 _! 
745 ! 
557 ; 
78 
22 ! 
21 
18 i 
6 
9 
6 
5 
4 
io ; 
3 ! 
6 
18_ 
1,096 
496 
154 
129 
85 
52 
27 
23 
17 
10 
11 
38 ! 
30 
24 
19_ 
235 
114 
40 
22 i 
18 
10 
5 
3 
4 
1 
3 
6 
5 
4 
20^ _ 
197 
76 
43 
17 
16 
8 
9 
! 4 
1 
! 4 
1 
7 
4 
! 7 
91 
149 
105 
i3 : 
8 
9 
1 
1 
! 1 
5 
3 
I 3 
1 
Total_ 
a 8, 974 
3,878 
1,321 
811 
526 
370 
228 
197 
1 178 
159 
149 
486 
312 
359 
Per cent_ 
100 
43.2 
| 
14.7 
9.0 
5. 9 
4.1 
2.5 
2.2 
2.0 
| 
1.8 
1.7 
5.4 
3. 5 
4.0 
« Totals of Tables XV and XVI do not agree with Table I, because this table includes most of the fires 
on private land in and adjacent to the forests, on which data were available. On the other hand, Table 
I includes some fires not included here, because elapsed times were not given. 
