Farmyard Manure. 33 



In the chemical analysis of this soil the following results were 

 obtained : 



Surface-soiL Subsoil. 



Moisture when analysed 5*36 3*66 



Organic matter and water of combination . . 25*86 8*79 



Oxides of iron and alumina 13'88 10-13 



Carbonate of lime 14'30 26'03 



Sulphate of lime *56 Not determined. 



Phosphoric acid and chlorine traces 



Carbonate of magnesia 1'04 j 



Potash -07 } 1-67 



Soda '. -18) 



Insoluble siliceous matter 38'75 49'73 



100-00 100-00 



2000 grains of this soil and 2000 grains of subsoil were mixed 

 with 4000 grains of the liquid from rotten dung. After 24 

 hours the clear liquid was carefully drawn off and filtered. Its 

 original dark brown colour was changed into a pale yellow 

 colour. This soil thus possessed in a high degree the property 

 of decolourizing dark-coloured liquids like the washings of dung- 

 heaps. 



1200 grains of the filtered liquid, passed through soil, were 

 distilled in a retort nearly to dryness, and the ammonia which 

 was given off carefully collected in an apparatus containing 

 hydrochloric acid, and so constructed as to secure the perfect 

 absorption of ammonia. 



The amount of chloride of ammonium obtained on evaporation 

 of the acid liquid in the receiving-vessel was "62 grains. This 

 gives for 1 imperial gallon of liquid passed through soil 11*49 

 grains of ammonia. 



Originally the drainings contained, per gallon .. .. 39-36 

 After filtration through soil they contained, per gallon 11-49 



Absorbed by 70,000 grains of soil .. .. 27'87 amm. 

 1000 grs. of this soil thus absorbed -396 of ammonia. 



On evaporation of another portion of the same liquid passed 

 through soil, 1 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 con- 

 tained : 



268-10 grains of solid organic substances. 

 368-98 of mineral matters. 



A considerable quantity of both organic and mineral matters 

 thus was removed from the liquid in contact with the soil. 



b. A similar experiment was made by diluting 4000 grains of 



