36 
Colorado Experiment Station 
T. S N. 
Sec. .13 
T. 
S N. 
Sec. 14 
T. 
S N. 
Sec. 24 
1 
31.6 
1 
22.4 
1 
20.1 
2 
18.7 
2 
19.6 
(15) 
O 
34.1 
3 
28.0 
3 
20.1 
5 
462.0 
(13 J 4 
14.5 
(14) 
4 
52.3 
7 
639.3 
5 
46 6.6 
5 
21.0 
9 
14.5 
G 
12.6 
6 
858.7 . 
7 
73.3 
7 
16.5 
' 
9 
17.7 
8 
21.5 
10 
27.1 
9 
9.8 
10 
19.6 
11 
19.6 
12 
28.9 
T. S N . 
Sec. 33 
K . U 7 
W. T 
7 N. Sec. G 
R. 07 
W. T. 
7 N. See. 7 
1 
9.3 
1 
8.9 
1 
59.7 
2 
9.8 
2 
7.9 
2 
60.7 
(16) 3 
18.6 
3 
10.8 
3 
21.0 
4 
9.3 
(17) 
4 
12.6 
( IS ) 
4 
15.9 
6 
830.7 
5 
15.9 
5 
9.8 
8 
134.9 
6 
9.8 
6 
32.7 
lu 
14.0 
7 
6.1 
7 
30.5 
11 
5.1 
8 
8.9 
8 
27.1 
12 
387.3 
9 
52.8 
9 
191.3 
10 
20.1 
10 
25.2 
11 
14.1 
11 
17.7 
12 
30 8 
12 
40.6 
The land given 
in this table 
as having been saiu] 
ded was 
supposed to be within the area of high fixation. Our prelim- 
inary work referred to had for its object the approximate de- 
temiination of this question. It will be noticed that in Sec. 20, 
T. 9 N., R. 68 W., only the eastern side of the section, our num- 
bers 4, G, 8 and 12 were sampled, and the nitric nitrogen present 
was found to be 7.5, 4.2, 4.6 and 2.8 p.p.m. This ground is 
neither high nor low, but a fair representative of average land. 
POWER OF THESE SOILS TO FIX NITROGEN 
It may appear to the reader, unfamiliar with the data, that 
we have given in other publications to show that our soils liave 
a very decided capacity for fixing nitrogen under both labora- 
tory and field conditions, and perhaps to the critical reader j 
who is familiar with these data, that in tlie preceding paragraph 
we are assuming fixation without proofs, whereas we should j 
produce tliem. Tlie fact is that we have studied this subject i 
in considerable detail for our Colorado soils. Hr. Sackett, of | 
this Station, has ])ublished three bulletius ]ieriaining to the i 
fixing, ammonifying and nitrifying efficiency of our soils. I 
assume that the presence of nitrates in soil is proof that the 
last two processes have been sufficiently vigorous for their }>ro- 
duction, and that the question of ])rime im])ortance in my work j 
