But to restrict this work merely to the methodical course of 

 investigation appeared to me too incomplete; on the contrary, I 

 considered it necessary to submit a short review of the apparatus 

 and reagents required for the investigation, as well as of the whole 

 of the proximate constituents hitherto known, in order that my 

 work might contain neai-ly everything most urgently required for 

 any phyto-chemical analysis, while dispensing with the necessity 

 of consulting other works, involving loss of time and often pro- 

 ducing unsatisfactory results.* 



WITTSTEIN. 



Munich, February, 1868. 



* All temperatures given in this book refer to the centesimal (Celsius') 

 thermometer. 



