HOW CROPS GROW. 
A TREATISE ON THE 
CHEMICAL COMPOSITION, STRUCTURE, 
AND LIFE OF THE PLANT, 
FOR 
ALL STUDENTS OF AGRICULTURE. 
WITH NUMEROUS ILLUSTRATIONS AND TABLES OF ANALYSES, 
BY 
eye 
SAMUEL W. JOHNSON, M. A., 
PROFESSOR OF ANALYTICAL AND AGRICULTURAL CHEMISTRY IN THE SHEFFIELD 
SCIENTIFIC SCHOOL OF YALE COLLEGE; CHEMIST TO THE OONNEC- 
TICUT STATE AGRICULTURAL SOCIETY; MEMBER OF THE 
NATIONAL ACADEMY OF SCIENCES, 
NEW YORK: 
ORANGE JUDD & COMPANY, 
245 BROADWAY. 
