HOW CROPS FEED. 



A TREATISE ON THE 



ATMOSPHERE AND THE SOIL 



AB RELATED TO THE 



NUTRITION OF AGRICULTURAL PLANTS. 



With Uluatrations, 



BY 



SAMUEL W. JOHNSON", M.A., 



E^OPESSOR OP ASALTTIOAL AND AGRICULTURAL CHEMISTRY IN THE ShEB>- 

 FIELD SCIBNTIPIC SCHOOL OF YaLE COLLEQE \ CHEMIST TO THE CON- 

 NECTICUT State Agricultural Society ; Member op 

 THE Kational Academy op Sciences. 



The work entitled " How Crops Grow " has been received with very great 

 fiivor, not only in America, but in Earope. The Author, therefore, puts forth 

 this volume— the companion and complement to the former— with the hope 

 that it also will be welcomed by those who appreciate the scientific aspects 

 of Agricnltuie, and are persuaded that a true Theory is the surest guide to a 

 successftil Practice. In this, as in tlie preceding volume, the Author's method 

 has been to bring forth all accessible facts, to present their evidence on the 

 topics under discussion, and dispassionately to record their verdict. K this 

 procedure be sometimes tedious, it is always safe, and there is no other mode 

 of treating a subject which can satisfy the earnest inquirer. It is, then, to all 

 Students of Agriculture, whether on the Farm or in the School, that this vol- 

 nme is specially commended. 



CONTEKTTS. 

 DIVISION I. 



The Atmosphere as Related to Yegetatton. 



CHAPTER I.— Atmospheric Air as Food op Plants. 



CHAPTER n. — ^The Atmosphere as P^bically Related to Vegetation. 



DIVISION II. 



The Soil as Belated to Vegetable Prodnction. 



CHAPTER I.— INTRODUOTORT. 



CHAPTER n.— Origin and Formation op Soils. 



CHAPTER HI.— Kinds op Soils, their Definition and Classification. 



CHAPTER IV.— Physical Characters of the Soil. 



CHAPTER v.— The Son. as a Source of Food to Crops: Ingredients 



WHOSE Elements are op Atmospheric Origin. 

 CHAPTER VI.— The Soil as a Source of Food to Crops Ingredients 



WHOSE Elements are Derived prom Rocks. 



Price, post-paid, $2. 



ORANGE JUDD COMPANY, 



751 Broadway, New-York. 



