130 MANURE. 



187. From these data may be calculated how 

 much ammonia will be formed ; for one part of nitro- 

 gen unites with three parts of hydrogen to form am- 

 monia, or in the atomic proportions by weight — 



14 of nitrogen, 

 3 of hydrogen, which form 



17 of real or pure ammonia. 



100 parts of fresh fallen cow dung will afford 

 therefore, 0*614, or 5-8 of a pound of pure ammo- 

 nia, or 2 # 13 lbs., or about 2 lbs. 2 oz. of carbonate 

 of ammonia of the shops, called sal volatile or salts 

 of hartshorn. 



188. Cow dung then, the type of manures, re- 

 solves itself into geine, free alkali, and salts. The 

 salts, considering the nitrogen as carbonate of ammo- 

 nia of the shops, will form about three per cent, of 

 the weight of the "dung ; or a bushel of 86 lbs. will 

 contain, in round numbers, 2 1-2 lbs. of salts of am- 

 monia, potash, soda and lime. 



1S9. The cow, then, is the great manufacturer of 

 salts and geine, and it is a question of the highest in- 

 terest, what is the daily produce of her manufactory ? 

 In order to determine this, the following experiment 

 was conducted with great care, at the barn connected 

 with the print works of the Merrimack manufacturing 



