HOW CROPS GROW. 



A TREATISE ON THE 



CHEMICAL COMPOSITION, STRUCTURE 

 AND LIFE OF THE PLANT, 



FOR 



ALL STUDENTS OF AGRICULTURE. 



WTTH NUMEROUS ILLUSTRATIONS AND TABLES OP ANALYSES. 



BY 



SAMUEL W. JOHNSON, M. A., 



PROFESSOR OF ANALYTICAL, AND AGRICULTURAL CHKMI8TR1 IX THE 



soito&quot;&amp;gt;i, or Y.VLB COLLEGE; CUEMIST TO THE CONNEC 

 TICUT 8TATK AGRICULTURAL SOCIETY; MEMBEB, OK TOB 

 NATIONAL, ACADEMY OF SCIENCES. 







NEW YORK: 



0. JUDD CO., DAVID W. JUDD, PBES T, 



751 BROADWAY. 



