for Tioenty Years in succession on the same Land. 
337 
gen per arre! On this point it may be stated that for every 
inch of rain carrying with it into the drains, or below the reach 
of the roots, 1 part of nitrogen per 100,000 parts of water, there 
will be a loss of (2 26) lbs. of nitrogen of manure per acre. If 
this fact be clearly fixed upon the mind, its great practical im- 
portance cannot fail to be recognised. 
Since this Section was in type, we have been favoured by 
Professor Frankland with numerous results of analysis of drain- 
age-water from the differently manured plots in the experimental 
field at Rothamsted, samples of which had, at his request, been 
supplied to him for investigation. He has also been good enough 
to give us permission to publish some of the results obtained 
relating to the amount of nitrogen in the waters in the form of 
nitrates and nitrites. Accordingly, we have, with his approval, 
selected for illustration those relating to the same plots as in the 
case of Dr. Voelcker's analyses, and those relating to six different 
periods of collection are taken. 
When considered in detail — with due regard to the supply of 
manure, to the previous rainfall, to the period of collection, to 
Table XL VI. — Composition of Drainage-water from Plots differently Manured ; 
Broadbalk Field, Rothamsted ; Wheat every Year, commencing 1844. 
Nitrogen as Nitrates and Nitrites, iier 100,000 parts of Water, 
Professor Frankland's Results. 
MANURES PER ACRE, PER ANNUM. 
Sulphates of Potass, Soda, and Magnesia, and 
Superphosphate of Lime. 
14 Tons 
Without 
DATES OF COLLECTION, &c. 
Farmyard 
Manure 
AVithout 
And 
And 
And 
And 
Manure 
every 
Nitrogen 
41 lbs. 
82 lbs. 
123 lbs. 
82 lbs. 
every 
Year. 
in 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Year. 
Manure 
as 
as 
as 
as 
since 
Ammonia- 
Ammonia- 
Ammonia- 
Nil rate 
1851. 
salts. 
salts. 
salts. 
Soda. 
Plot 2. 
Plots 3, 4. 
Plot 5. 
Plot 6. 
Plot 7. 
Plot 8. 
Plot 9. 
Jan. 5, 1872, moderate flow 
2-592 
1-312 
1-418 
2-777 
4-744 
7-841 
2-311 
May 18, 1872, moderate flow- 
0-031 
0-071 
0-051 
0-059 
0-094 
1-647 
June 11, 1872, small flow 
0 
0 
0 
0 
(') 
(') 
Oct. 26, 1872, moderate flow 
0-932 
0'366 
0-360 
1-354 
2-303 
1-808 
0-975 
Jan. 19, 1873, moderate flow 
0-084 
0-057 
0-157 
0-4.54 
1-294 
1-522 
C) 
Feb. 26, 1873, small flow 
0'082 
0-131 
0-088 
0-122 
0-461 
0-441 
0-264 
Means 
0-922 
0-316 
0-349 
0-793 
1-477 
1-951 
1 -039 
(') lu these cases the drains did not run; and as there was little or no loss of nitrogen from 
hose that did, it is assumed that there was little or none in these, and hence, for fair comparison, 
he means are — for Plots 3-4, 5, 6, 7, and 8, taken as for 6 experiments. For Plot 2, however, 
:hey are only taken for 4, and for Plot 9 for 5, experiments. 
C) On January 19, 1873, the drain from Plot 9 ran a little, but had ceased to do so when the 
iamples were collected. 
