PREFACE TO VOLUME SECOND 



In this volume an attempt has been made to treat the subject of 

 fertilizers and fertilizing materials in the manner followed in 

 the first volume with soils. The general principles of fertilizer 

 manufacture and application have been presented in so far as 

 they seemed to throw light on the rational method of examination 

 and analysis. The standard methods of analysis in use in this 

 and other countries, have been presented with sufficient fullness 

 for the guidance of the skilled worker, and the information of 

 the student. To those who make use of a book only for routine 

 work or for preparation for an examination, this volume, as its 

 predecessor, will be found to have little attraction. This fact, 

 however, will not be a cause of regret to the author whose pur- 

 pose has been, avowedly, to present to the busy worker and stu- 

 dent a broad view of a great subject which each one does not have 

 the time to search out for himself. 



It is a matter of regret, however, that the contents of the vol- 

 ume have again exceeded all expectations. It was found im- 

 practicable to secure any greater condensation without depart- 

 ing from the purpose, and impairing the completeness of the 

 work. When work is done with no prospect of financial com- 

 pensation, it is gratifying to find it appreciated, and the author 

 will be content to have this volume meet with as kindly a recep- 

 tion as has been accorded volume one. 



HARVEY W. WILEY. 



WASHINGTON, D. C., 

 End of July, 



