EDITOR'S PREFACE 



The very favorable reception by the public of a transla- 

 tion of Dr. Stockhardt's Principles of Chemistry, which has 

 rapidly passed through ten editions, has been considered a 

 sufficient inducement to offer a translation of his recent 

 work, entitled " Chemical Field Lectures." 



This, as might be expected, is characterized by the same 

 clearness and simplicity which run through his other work, 

 with the additional recommendation, that, as he states, he 

 has especially exerted himself, and it is believed success- 

 fully, to make the subject perfectly intelligible and truly 

 useful to the " non-chemical " agriculturist. 



Some of the leading principles of agriculture, which have 

 for the last few years been prominent subjects of discussion, 

 are here amply treated of, and, as I think, placed exactly 

 in their right view and position. 



Amongst these, one of the chief points is the use and 

 value for vegetation of nitrogen, in its practical form, am- 



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