HOW CROPS GROW. 



A TREATISE ON THE 



CHEMICAL COMPOSITION, STRUCTURE, 

 AND LIFE OF THE PLANT, 



ALL STUDENTS OF AGRICULTURE. 



WITH NUMEROUS ILLUSTRATIONS AND TABLES OF ANALYSES. 



SAMUEL W. JOHNSON", M. A., 



PROFESSOR OF ANALYTICAL AND AGRICULTURAL CHEMISTRY IN THE SHEFFIELD 

 SCIENTIFIC SCHOOL OF YALE COLLEGE; CHEMIST TO THE CONNEC- 

 TICUT STATE AGRICULTURAL SOCIETY; MEMBER OF THE 

 NATIONAL ACADEMY OF SCIENCES. 



NEW YORK: 



ORANGE JUDD & COMPANY, 

 245 BROADWAY. 



