C 263 3 



The species of urine that contain most albumen, 

 gelatine and urea, are the best as manures ; and all 

 urine contains the essential elements of vegetables in a 

 state of solution. 



During the putrefaction of urine the greatest 

 part of the soluble animal matter that it contains is 

 destroyed ; it should consequently be used as fresh 

 .as possible ; but if not mixed with solid matter, it 

 should be diluted with water, as when pure it contains 

 too large a quantity of animal matter to form a pro- 

 per fluid nourishment for absorption by the roots of 

 plants. 



Putrid urine abounds in ammoniacal salts ; and 

 though less active than fresh urine, is a very power- 

 ful manure. 



According to a recent analysis published by Ber- 

 zelius, 1000 parts of urine are composed of 



Water - - 933 



Urea - 3O.1 



Uric acid 1 



Muriate of ammonia, free lactic acid,"*) 

 lactate of ammonia and animal j>17.14 

 matter - - J 



The remainder different salts, phosphates, sul- 

 phates, and muriates. 



Amongst excrementitious solid substances used 

 as manures, one of the most powerful is the dung oi ? 

 birds that feed on animal food, particularly the dung of 

 sea birds. The guano> which is used to a great extent 

 in South America, and which is the manure that fer- 

 tilizes the sterile plains of Peru, is a production of this 



