On the Chemical Properties of Soils. 25 



ammonia absorbed by the soil in the preceding experiment, 

 1000 grains of liquid would have contained *121 of ammonia ; 

 consequently "071 of ammonia were extracted by every 1000 grains 

 of liquid, or *642 grains by the whole liquid, from the ammonia 

 which the soil retained 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 *61 grains by 

 the whole liquid from the soil, after having been washed twice 

 before with water. 



4:th 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 '096 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. 



5th 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. 



Qth Experiment. After a fresh addition of 7000 grains of dis- 

 tilled water 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 "193 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 '005 grains of ammonia ; thus '026 

 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 : 



