30 MANUKES. 



Originally the drainings contained, per gallon, 39.36 



After filtration through soil they contained, per gal., 11.49 



Absorbed by "70,000 grains of soil, 27.87 am. 



1,000 grains of this soil, thus absorbed 396 of ammonia. 



On evaporation of another portion of the same liquid passed 

 through soil, one imperial gallon of filtered drainings was found to 

 contain 164.88 of organic matter ; 210.20 of inorganic matter.- 



Before filtration through soil, the imperial gallon contained 

 268.10 grains of solid organic substances ; 368.98 of mineral mat- 

 ters, 



A considerable quantity of both organic and mineral matters 

 thus removed from the liquid in contact with the soil. 



A similar experiment was made by diluting 4,000 grains of the 

 same drainings with 4,000 grains of distilled water, and leaving 

 the more dilute liquid in contact for twenty-four hours with 2,000 

 grains of the same soil, and 2,000 of subsoil. 



The filtered liquid contained in the gallon : 



Ammonia, 6.91 



Organic matters, 118.50 



Mineral matters, 147.36 



Total amount of solid matters in a gallon, 272.77 



The 147.36 of mineral matters (ash) consisted of: 



Silica, 2.38 



Phosphates of lime and iron, 1.^4 



Carbonate of lime, 79.72 



Carbonate of magnesia, 6.17 



Sulphate of lime, 7.92 



Chloride of sodium, 18.90 



Chloride of potassium, 26.44 



Carbonate of potash, 4.29 



Originally the liquid employed in this experiment contained 



19.68 grains of ammonia to the gallon. After passing through 



half its weight of soil, it contained only 6.91 grains of ammonia; 



consequently 12.77 were retained by 35,000 grains of soil, and 



1,000 grains of the same soil absorbed 396 grains of ammonia. In 



both instances it was thus found that rather more than two-thirds 



of the amount of ammonia present in these drainings, in the form 



of ammoniacal salts, were retained by a very limited quantity of 



