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 
SAMUEL W. JOHNSON, M. A. 
PROFESSOR OF ANALYTICAL AND AGRICULTURAL CHEMISTRY IN THE SEPFFIBLD 
SOIENTIFIO SCHOOL OF YALE COLLEGE; OHEMIS’ TO THE OCNNEG 
TIOUT STATE AGRICULTURAL SOCIETY; MEMBER OF THE 
NATIONAL AOADEMY OF SCIENCES, 
CIBER ART 
aw YORE 
BOTANICAL 
ratwetirRen 
NEW YORK: 
0. JUDD CO., DAVID W. JUDD, Przs’r, 
751 BROADWAY. 
1888, 
