148 MANURE. 



Nitrogen of the soluble ammoniacal salts, . .1.67 

 Do. of the ammonia-phosphate of magnesia, .64 

 Do. of the organic matter, . . . 11.60 



13.91 



It will be noted, that Soubeiran finds a much larger per 

 centage of nitrogen in manure than other analysts. He ob- 

 jects to the estimates usually made, because these have 

 been founded on dry manure, which thus has lost ammo- 

 nia by its salts being decomposed by the carbonate of lime 

 present. Fresh dung loses thus by drying | of its ammo- 

 nia. Hence, the equivalent of poudrette and all fermented 

 manures is generally placed much too low, when calculated 

 on their nitrogen only. Taking into view all the circum- 

 stances which affect the nitrogen in yard-manure, the quan- 

 tity must vary exceedingly ; but it has been estimated by 

 Payen and Boussingault to be 0.41 per cent. ; hence its car- 

 bonate of ammonia becomes equal to about 1.78 lb. in each 

 100 lbs. The weights of equal bulks of ox and horse-dung, 

 from the barn yard and stable, as usually prepared, are as 

 follows : 



Ox-manure, old and fat, one cubic foot weighs 58 lbs. 



Do. fresh, " " 48 " 



Horse-manure, old and fat, " " 39 " 



Do. fresh, " " 30 " 



It has been ascertained that an ox in France affords 5,600 

 lbs., and a horse and a half, or ten to fifteen sheep, an equal 

 amount of yard-manure per year. 



But yard-manure too often is exposed to rain. Its salts 

 are thus washed out, or the natural liquids mixed with it 

 drain away, and are thus lost. It is a positive money-loss, 

 for the composition of an imperial gallon of this muck-water, 



