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and also for the watering of cattle, provided 

 it does not contain enough to impair its pota- 

 bility. 



Boussingault found that the waters, used for 

 watering the cattle atBechelbronn, introduced, 

 annually, into the dung more than two hun- 

 dred pounds of alkaline salts. 



Note. — There is an omission in the preceding Chapter, of 

 two important fertilizing agents, Gas Lime and Green Sand. 



Gas Lime. The refuse lime from the Gas Works, though 

 containing much Sulphuretted Salt, is rich in uncombined lime, 

 and consetiuently is an effectual manure when used judiciously. 

 When spread upon the soil it becomes decomposed, and gra- 

 dually trzinsformed into sulphate of lime, (gypsum). It is said 

 to be an excellent addition to land, technically termed, "clover 

 tired ;" and, also a good preventive of noxious grubs and in- 

 sects. Care must be taken in applying it to the land to prevent 

 immediate contact with the seed 



Green Sand. This Manure, now largely used in Agricul- 

 ture, produces a remarkable effect upon crops, which is due to 

 its content of potassa, lime and phosphates. The proportion per 

 acre varies from 30 to 300 bushels. For full particulars, see 

 " Encyclopaedia of Chemistry, ^^ and " Booth's Report upon 

 The Geology of Delaware." 



