HOW CROPS GROW. 



A TREATISE ON THE 



CHEMICAL COMPOSITION, STRUCTURE, 

 AND LIFE OF THE PLANT, 



ALL STUDENTS OF AGRICULTURE. 



•WTTH NUMEHOUS ILLTJSTBATIONS AND TABLES OF ANALYSES. 



BT 



SAMUEL W. JOHJSrSOIsr, M. A., 



PB0FBS30R OF AJTALTTIOAL AND AGniCTTLTITEAL CHEMISTET IN" THE SHEFFIELD 



SOtESTIFIO SCHOOL OF TALE COLLEGE; CHEMIST TO THE COITNEC- 



TIOUT STATE AGBIOULTUEAL SOCIETY; MEMBER OF THE 



NATIOa^AL ACADEMY OF SCIENCES. 



NEW YORK: 



ORANGE JUDD & COMPANY, 



345 BROADWAY. 



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