MANURES. 



79 



than the surface-soil. The mechanical analyses of soil and subsoil 

 gave the following result : 



100.00 



100.00 



In the chemical analysis of this soil, the 

 obtained : 



Moisture when analyzed. 



Organic matter and water of combination, 



Oxides of iron and alumina. 



Carbonate of lime. 



Sulphate of lime. 



Phosphoric acid and chlorine, 



Carbonate of magnesia. 



Potash, 



Soda, 



Insoluble silicious matter, 



following results were 



100.00 



100.00 



2,000 grains of this soil and 2,000 grains of subsoil were mixed 

 with 4,000 grains of the liquid from rotten dung. After twenty-four 

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

 original dark-brown color was changed into a pale yellow color. 

 This soil thus possessed in a high degree the property of decolor- 

 izing dark-colored liquids like the washings of dung-heaps. 



1,200 grains of the filtered liquid, passed through soil, were dis- 

 tilled in a retort nearly to dryness, and the ammonia which was 

 given off carefully collected in an apparatus containing hydrochlo- 

 ric acid, and so constructed as to secure the perfect absorption of 

 ammonia. 



The amount of chlorine of ammonia obtained on evaporation of 

 the acid liquid in the receiving vessel was 62 grains. This gives 

 for one imperial gallon of liquid passed through soil, 11.49 grains 

 of ammonia. 



