5QO DECEMBER. 



" In the above processes, the principal things to 

 be attended to, are, 



" Whether there be any metallic, or aluminous 

 salts, as these are absolute poisons, and therefore are 

 to be decomposed by quick-lime. 



" Whether there be such a proprotion of neutral 

 or earthy salts as to be hurtful, in which case, the so- 

 lution m process (second) will taste salt : a soil con- 

 taining them in so large a proportion, will hardly 

 ever admit of culture for grain. 



" Whether there be calcareous earth, and in what 

 proportion, as that ascertains the propriety of apply- 

 ing any manure containing it, and the quantity of 

 that manure. 



" What the proportion of sand and clay is, which 

 ascertains the propriety of adding sand or clay. 



" Whether there be pyrites, as that shews why 

 and when a soil will be long of being brought into 

 cultivation. 



" Pyrites are best destroyed by fallowing, and 

 afterwards applying lime." 



When Mr. Professor Davy, of the Board of Agri- 

 culture, shall publish his excellent lectures, a more 

 exact analysis will be explained. 



If in this method of analyzing a soil the propor- 

 tion of calcareous earth be large, the trial of the gun- 

 barrel will give a quantity of gas proportioned to 

 such quantity of calcareous earth, for which allow- 

 ance must be made ; but if that quantity be small, 

 the ounce measures of air or gas gained from an 



ounce 



