PREFACE. 



The little book is an abridged edition of the author's, Soil 

 Fertility and Fertilizers. The symbol* has been used throughout 

 the text to refer to notes, in the back of the book, that state the 

 topics of subject matter that have necessarily been omitted in 

 this work. 



This book has been written to be within the reach of the 

 farmer, student, or any other person interested in the subject, 

 "Fertilizers," and should more complete data be desired the 

 unabridged edition, Soil Fertility and Fertilizers should be con- 

 sulted. 



The writer is indebted to the Louisiana Experiment Station, 

 for illustrations. 



J. E. HALLIGAN. 

 Baton Rouge, La. 



247081 



