Liquid Manure. 
143 
2. Like the preceding soil the pasture land yielded to liquid 
manure some additional organic matter. This organic matter 
likewise contained some nitrogen. 
3. The filtered liquid contained nearly 21 grains more of 
.mineral matter than the manure before coming in contact with 
soil. 
4. This increase in mineral matter is chiefly due to carbonate 
of lime, which is much more abundant in the filtered liquid than 
in the original liquid manure. 
It is chiefly in the state of bi-carbonate that lime occurs in the 
manure ; only a small proportion occurs as sulphate of lime or 
gypsum. 
If the sulphuric acid in these analyses is united with lime to 
form gypsum, and the rest of the lime calculated as bi-carbonate 
of lime, there will be in the liquid manure — 
Before After 
Filtration. Filtration. 
Sulphate of lime f)'69 4'64 
Bi-carbonate of lime 22-45 59-91 
It will be seen that the proportion of bi-carbonate of lime 
which passed into the liquid manure is greater than in the pre- 
ceding experiment, notwithstanding the much larger quantity of 
carbonate of lime in the Cirencester soil. We have here an 
indication that the changes which take place when manuring 
matters are brought into contact with soil are not merely depen- 
dent on the percentage composition of the soil, but likewise on the 
state of combination in which the constituents occur in the soil. 
A soil containing much less lime may thus yield to a liquid 
containing a number of organic and inorganic compounds even 
more lime than another soil three or four times as rich in car- 
bonate of lime. 
5. The proportion of chloride of sodium (common salt) in the 
filtered liquid is nearly as large as in the original liquid. 
6. On the other hand the absorption of potash is very marked. 
Originally the manure contained 16 92 of potash and 2'87 of 
chloride of potassium per gallon. After having been left in 
contact with soil it only contained 5'19 grains of potash and 4*88 
grains of chloride of potassium. Calculating the potassium in 
chloride of potassium as potash, and adding it to the rest, we 
have — 
Grains of 
Potash. 
In manure before filtration 18-65 
„ after filtration 8-26 
Difi'erence 10-39 
20,000 grains of soil in this experiment thus absorbed 10-3S) 
grains of potash, or 1000 grains absorbed '519 grains of potash. 
