PREFACE TO SECOND EDITION 



A great part of the material relating to the occurrence and 

 analysis of ammonia, nitrous and nitric acid printed in the first 

 volume of the first edition of this work has been rewritten and 

 transferred to this volume. This rearrangement has resulted 

 in making the first and second revised volumes of approximately 

 the same size. 



All the matter of this volume has been rewritten and brought 

 down to date. New features of moment are those relating to the 

 production of nitric acid for manurial purposes from cyanamid 

 and by direct electric oxidation of the nitrogen of the air. A 

 chapter on the analysis of insecticides has also been added. 



While not intended in any way as a laboratory guide it is 

 hoped this volume may be even more highly appreciated than 

 in its first form by the student, the investigator and the teacher. 



H. W. WILEY. 

 November, 190%. 



