PREFACE. 



The purpose of this work is to supply a complete 

 manual of chemical analysis, for the use, especially, of 

 agricultural students. 



The qualitative and quantitative processes that are de- 

 scribed refer only to such substances as are found in soils, 

 plants, animals, fertilizers, or other materials or products 

 of agriculture ; and, moreover, in order to reduce the size, 

 and consequently the cost of the book as much as possi- 

 ble, except in two or three instances, only those methods 

 of analysis are introduced which are most commonly 

 used by good chemists, and have been tried and found 

 reliable, with such improvements as have been made in 

 more recent practice. 



The chapters on Special Analyses consist, in the main, 

 of a translation of the " AnUitung zur Ghemischen Tin- 

 tersuchung landwirthschaftlich-wichtiger Stoffe^ von Dr. 

 Emil Wolff, 2te Avflage, 1867," a work of the first au- 

 thority in Germany ; two or three unimportant matters 

 have been omitted, the arrangement has been somewhat 

 altered, and some additions have been made to the original. 



The other chapters, on reagents, manipulation, etc., ?ire 

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