252 On the Bain and Drainaje -TFatcrs at Rothamsted. 
employed at Rothamsted. The nitric acid was determined by 
a new and delicate method devised lor the purpose by Professor 
Way. The details of this investigation will be found in the 
Royal Agricultural Society's Journal, vol. xvil. 142, 618. A 
summary of the results is given in Table VI. The figures given 
by Way have been recalculated so as to compare with the other 
analyses in this Paper. 
Table VI. — Nitrogen as Ammonia and Nitric Acid in Eain Water 
collected at Eothamsted in 1855 and 1856. 
1855. 
1856. 
Nitrogen per Million. 
Nitrogen per Million. 
Rainfall 
Rainfall 
Incbes. 
As 
Incbes. 
As 
As 
As 
Ammonia. 
Nitric 
Acid. 
Ammonia. 
Nitric 
Acid. 
0 
598 
1 
08 
0 
06 
2 
782 
0 
93 
0 
09 
0 
993 
1 
22 
0 
16 
1 
352 
1 
60 
0 
07 
2 
364 
1 
01 
0 
08 
1 
004 
1 
09 
0 
13 
0 
410 
1 
45 
0 
13 
2 
611 
1 
72 
0 
07 
May 
2 
324 
0 
94 
0 
13 
4 
707 
1 
49 
0 
10 
1 
647 
1 
59 
0 
30 
1 
912 
1 
33 
0 
17 
6 
956 
0 
72 
0 
00 
1 
484 
1 
00 
0 
13 
2 
633 
0 
94 
0 
22 
2 
645 
0 
82 
0 
13 
1 
545 
1 
12 
0 
08 
2 
187 
1 
42 
0 
13 
5 
501 
0 
72 
0 
13 
2 
874 
0 
71 
0 
12 
2 
473 
0 
64 
0 
07 
1 
422 
0 
94 
0 
16 
1 
722 
0 
79 
0 
06 
2 
235 
0 
94 
0 
15 
"Whole Year 
29 
166 
0-88 
0 
12 
27 
215 
1 
18 
0 
12 
It appears that on the whole a somewhat larger amount of 
ammonia was found by Way than in the previous determinations 
at Rothamsted ; this is especially the case in the analyses of 
rain-water collected in 1850. On the average of the whole 24 
months Way found the proportion of nitrogen in the form of 
ammonia to be 1"03 per million of rain-water. The nitrogen 
existing as nitric acid is a far smaller quantity, averaging in 
the 24 months only 0*12 per million. Bousslngault had found 
in rain-water collected on a wooded hillside at Liebfrauen- 
berg, from May to November 1852, an average of 0'48 parts 
of nitrogen as ammonia per million of water. In rain collected 
at the same place at a similar time of year in 1856 and 1857, 
he found the nitrogen as nitric acid to average only 0*048 per 
million. 
The results "fiven in Tables V. and VI. show that the 
quantity of ammonia in rain-water is subject to very con- 
