On the Chemical Properties of Soils. 
127 
ammonia absorbed by the soil in the preceding experiment, 
1000 grains of li([uid would have contained •121 of ammonia; 
conse(]uently •071 of ammonia were extracted by every 1000 grains 
of li(iuid, or ^642 grains by the whole li(juid, from the ammonia 
which the soil retaint^d after having been once washed with 7000 
grains of water. 
'3rd Experiment. — 7000 grains of distilled water were added to 
the residue left in bottle from the 2nd Experiment, and treated 
as before. 1000 grains of clear liquid contained •111 grains of 
ammonia. If no ammonia had been extracted by this third addi- 
tion of water, 1000 grains of liquid would have contained "044 
of ammonia, instead of •111 grains ; consequently '067 grains of 
ammonia were extracted by every 1000 grains, or •Gl grains by 
the whole liquid from the soil, after having been washed twice 
before with water. 
4//t Experiment. — To the residue left in bottle from 3rd Ex- 
periment 7000 grains of distilled water were again added, and 
the bottle put aside for two months. After that time the clear 
liquid was drawn off, weighed, and its strength determined. 
1000 grains of liquid contained •OOfi grains of ammonia. Had 
no ammonia been extracted from the soil it would have con- 
tained "037 grains of ammonia in 1000 grains ; accordingly -059 
of ammonia were extracted by every 1000 grains of liquid, or •622 
grains by the entire liquid. This quantity, it will be observed, 
is almost identical with that extracted in the 3rd Experiment. 
hth Experiment. — After a fresh addition of 7000 grains of dis- 
tilled water, 1000 grains of liquid contained '040 grains of 
ammonia. Had no ammonia been extracted from the soil it 
would have contained '028 grains ; therefore "012 grains were 
extracted by every 1000 grains of liquid, or "120 grains by the 
entire solution. 
&th Experiment. — After a fresh addition of 7000 grains of dis- 
tilled Avater 1000 grains of liquid contained ^029 grains of am- 
monia. If no ammonia had been extracted 1000 grains of liquid 
would have contained '006 grains ; therefore "023 grains of am- 
monia were extracted by every 1000 grains, or •I 93 grains by 
the entire quantity of liquid. 
1th Experiment. — 7000 grains of distilled water were, for the 
seventh time, added to the residue left in the bottle from the 6th 
Experiment, and treated as before. 1000 grains of liquid con- 
tained '031 grains of ammonia. Had no ammonia been extracted 
they would have contained •OOS grains of ammonia"; thus ^02 6 
grains of ammonia were extracted from the soil by every 1000 
grains, or "228 grains from the entire liquid. 
Let us then add up the quantities of ammonia removed by 
these successive washings with water : — 
