RURAL TEXTBOOK SERIES Continued 



Manures and Fertilizers 



BY H. J. WHEELER, PH.D., D.Sc. 



Formerly Director of the Rhode Island Experiment Station 



Illustrated, cloth, I2mo ; preparing 



The clear and unusually full discussion of the practical utiliza- 

 tion of manures and fertilizers of all kinds, and of their relations 

 to the plant and to the soil, makes this book not only an excel- 

 lent text for college students, but also one which will be gener- 

 ally welcomed by all up-to-date agriculturists. All the animal 

 manures, litter, and waste nitrogeneous materials of every sort 

 are discussed. A helpful feature for the student is the extended 

 treatment of the availability of organic nitrogen and of the or- 

 ganisms contained in barnyard manure which give rise to the 

 various fermentations taking place therein. The well-known, 

 and also the new, nitrogenous manures such as calcium cyan- 

 amid and calcium nitrate are considered in detail. The chap- 

 ters devoted to the potash salts, phosphates, lime, magnesia, 

 soda, gypsum, iron, and manganese are exceptionally complete, 

 and chlorin, sulfur, silica, carbon disulfid, toluene, and other 

 substances exerting catalytic and other effects are described. 

 Much of the material in this book which will be new to students 

 and other readers has suggested itself to the author in the 

 course of twenty-two years of continuous research. 



Corn Crops 



BY E. G. MONTGOMERY 



Professor of Farm Crops in the College of Agriculture at Cornell University 



Preparing 



This is a textbook on corn and the sorghum crops, including 

 the grain sorghums, the sweet sorghums for sirup or forage, 

 and the broom corns. In it plant structures, physiology, and 

 the other technical phases of the subject are separated from 

 the more practical phases which might be classed as cultural 

 methods. Hence, the entire book is adapted to use as a text 

 in an advanced course, and the treatment of cultural methods is 

 adapted to use in more elementary courses. The book is also 

 an excellent handbook for farmers and others interested in the 

 production or handling of corn or sorghums. 



THE MACMILLAN COMPANY 



Publishers 64-66 Fifth Avenue New York 



