222 WALL'S MANUAL 



By pursuing either of the above methods, 

 phosphate, or the superphosphate of lime, will be 

 produced, which will act very beneficially in forcing 

 vegetation with all crops, and especially in forming 

 the seed. A special mixture of guano a.nd super- 

 phosphate of lime has been described before for 

 crops of corn, cotton, wheat, etc. 



CHILIAN SALTPETRE AND COMMON SALT, 



Among the stimulants w r hich may sometimes be 

 used to advantage, both by themselves and in 

 addition to stable manure or to the compost pile, we 

 may mention common salt and Chilian saltpetre, or 

 nitrate of soda, They act as solvents and decompos- 

 ing agents, somewhat in the manner of ammoniacal 

 salts, and the farmer ought to understand distinctly, 

 that large crops, resulting from their use, have been 

 produced entirely at the expense of his soil, Both 

 salts, being but slightly absorbed by the soil, are 

 soon removed from it, to a great extent, by drain 

 water. 



COLUMBIAN GUANO. 



There is imported from South America, under the 

 appellation of " Columbian Guano," a substance very 

 different from the Peruvian article, which consists 

 chiefly of phosphate and carbonate of lime, but it 

 contains no ammonia, or only traces of it. It may 

 be used in the same way as ground bones, or super= 

 phosphate of lime ; it is not, however, as energetic in 

 action as the latter, being much less soluble. 



It has been attempted, and apparently with 

 considerable success, to remedy the slowness of 



