PREFACE. 



THE attempt has been made in this volume to 

 give a brief statement of the elementary 

 principles and chief facts on the subjects of which 

 it treats. Chapters one to eight, and twenty, 

 twenty-one and twenty-two were prepared by Mr. 

 Morrow^ ; the others by Mr. Hunt. 



The authors have drawn freely from many 

 sources, both for matter and illustrations, and can 

 only acknowledge in this general way their indebt- 

 edness to many sources of information. 



In the preparation of th^ chapters on Soils, 

 Warington's "Chemistry of the Farm" was found 

 especially helpful, and for the chapters on Cereals 

 especial indebtedness is acknowledged to the ex- 

 haustive monograph on cereals by Prof. W. H. 

 Brewer, in the Keports of the Tenth Census. 

 Dr. W. C. Stubbs kindly revised manuscript of 

 chapter on Sugar Plants and Prof. S. M. Tracy 

 that on Cotton. 

 January, 1892. 



