Tilth and Tillage of the Soil 1777 



ADVANCED READING 



The Reading-Course lessons are designed merely to introduce the 

 subject; they are elementary and brief, and are intended to arouse 

 a desire for fuller knowledge along particular lines. The study of Read- 

 ing-Course lessons should be introductory to the study of standard 

 agricultural books and of the bulletins of the United States Department 

 of Agriculture and the state experiment stations. • The Supervisor of the 

 Reading-Course will suggest, as far as possible, agricultural literature to 

 meet the needs of any reader. Particular books or bulletins are recom- 

 mended because they are thought to be of special interest to the reader 

 in his individual study and not because they are considered superior to 

 others on the same subject. 



Principles of soil management. T. L. Lyon and E. 0. Fippin. 

 Pages 68-1 19, 465-497. The Macmillan Company, New York 

 City $i.7S 



Fertilizers and crops. L. L. Van Slyke. Pages 89-104. Orange 



Judd Company, New York City 2 . 50 



Farm machinery and farm motors. J. B. Davidson and L. W. 

 Chase. Pages 51-101. Orange Judd Company, New York 

 City 2 . 00 



Physics of agriculture. F. H. King. Pages 108-128, 223-254. 



Published by the author, Madison, Wisconsin 1.75 



Bulletins, United States Bureau of Soils : 



No. 50. Moisture content and the physical condition of soils 



No. 82. The effect of soluble salts on the physical properties of soils 



(Distributed by Superintendent of Documents, Washington, D. C, at 



a nominal price) 



Farmer's Bulletins: 



No. 421. Control of blowing soils (Free on application to Senators or 

 Representatives in Congress or to the Secretary of Agriculture, Washing- 

 ton, D. C.) 



Bulletins, Kansas Agricultural Experiment Station (Manhattan, Kansas) : 

 No. 127. The roots of plants 



