and  Subsoils  of  some  of  the  Fields  at  Rothamsted.  349 
In  Table  VI.  will  be  found  the  quantities  of  nitrogen  as  nitric 
acid  existing  in  the  first,  second,  and  third  9 inches  of  soil  in 
the  various  plots  of  Broadbalk  Field,  when  sampled  on  October 
10-18,  1881.  In  the  same  Table  are  given  the  estimated 
quantities  of  nitrogen  as  nitrates  removed  from  each  plot  in  the 
drainage-water  after  the  first  starting  of  the  drain-pipes  on 
August  30.  The  estimates  are  calculated  from  the  composition 
Table  VI. — Nitrogen  as  Nitric  Acid  in  tbe  Soil  and  Subsoil,  and  in  the 
Drainage-Water  of  various  Plots  in  Broadbalk  Wheat-Field,  in  lbs. 
per  Acre. 
In  the  Soil  when  Sampled  October  10-18,  1881. 
Estimated  as  removed  in  Drain- 
age, August  30— January  31. 
Estimated 
in  Soil 
Plot. 
Total 
Excess  over : — 
if  no 
First 
Second 
Third 
Twenty- 
Before 
After 
Drainage 
before 
Nine 
Nine 
Nine 
Soil 
Soil 
Total 
Inches. 
Inches. 
Inches. 
Inches. 
Plots 
3 & 4 
Plot  5a. 
Sampling. 
Sampling. 
Sampling. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
2 
300 
15-4 
6-8 
52-2 
35 '8 
27-9 
# , 
. . 
3 
4 
9-7 
9-2 
5-3 
40 
2-8 
1-8 
17-8 
150 
- 
— 6*5 
- 9*3 
} 13 
10-3 
11-6 
17-7 
5a 
12-6 
71 
4-6 
24-3 
7-9 
1-3 
11-9 
13-2 
25-6 
6a 
16-5 
7-5 
4-7 
28-7 
12-3 
4-4 
1-5 
16*0 
17-5 
30-2 
7a 
22-8 
11-3 
5-7 
39-8 
23-4 
15*5 
[3-5] 
20-6 
24-1 
43-3 
8 a 
211 
13-9 
7-8 
428 
26-4 
18-5 
? 
30-1 
9 a 
19-7 
10-0 
8-2 
37-9 
21-5 
13-6 
25-2 
9b 
16-3 
20-1 
17-7 
54-1 
37-7 
29-8 
i ? 
*• 
*• 
10  a 
10  b 
14-2 
13-4 
11-9 
9-0 
7-3 
5-9 
33-4 
28-3 
17-0 
11-9 
9-1 
4-0 
} 7-0 
24-1 
311 
37-9 
11a 
17-9 
9-3 
3-6 
30-8 
14-4 
6*5 
4-7 
22-8 
27-5 
35-5 
12  a 
15-3 
10-3 
4-4 
30-0 
13-6 
5-7 
2-7 
18-1 
20-8 
32-7 
13a 
131 
8-9 
2-6 
24-6 
8-2 
0-3 
2-7 
16-7 
19-4 
27-3 
14  a 
16-1 
8-7 
3-6 
28-4 
12-0 
4-1 
? 
17-1 
15  a 
13-4 
10-7 
4-1 
28-2 
11-8 
3-9 
. , 
. , 
16  a 
10-6 
5-0 
[2-3] 
17-9 
1-5 
- 6-4 
i-7 
8-7 
10-4 
19-6 
17  a* 
10-3 
7-5 
3-4 
21-2 
4-8 
- 3-1 
2-6 
10-3 
12-9 
23-8 
18  A* 
11-4 
8-4 
5-2 
25-0 
8-6 
0-7 
? 
13-2 
. . 
. . 
19 
141 
130 
7-1 
34-2 
17-8 
9-9 
•• 
•• 
•* 
* The  manures  on  Plots  17  and  18  alternate.  This  year  Plot  17  had  received  only 
Mixed  Mineral  Manure,  and  Plot  18,  400  lbs.  of  Ammonium-salts. 
of  the  water  issuing  from  the  drain-pipes  (Table  V.),  the 
quantity  of  the  drainage  being  assumed  as  equal  to  that  shown 
by  the  60-inch  soil  drain-gauge.  The  amount  removed  in 
drainage  before  the  samples  of  soil  were  taken  is  given  separately 
in  Table  VI. ; and  in  the  right-hand  column  this  amount  is 
added  to  that  found  in  the  soil,  thus  showing,  as  far  as  in  our 
power,  the  amount  of  nitrogen  as  nitric  acid  which  would  have 
been  present  in  the  soil  if  no  drainage  had  occurred.  In  the 
case  of  several  of  the  plots  no  drainage  before  soil-sampling 
