xiv TABLE OF CONTENTS 



PAGE 



E. THE LAW OF DIMINISHING RETURNS FROM LAND 



51. The Classic Statement of Diminishing Returns. David 

 Ricardo 18 1 



52. Extensive and Intensive Margins of Cultivation. Henry 

 Rogers Seager 182 



53. The Law of Diminishing Returns Elaborated and Qualified. 

 John Stuart Mill 182 



54. Scientific Research as a Means of Increasing Agricultural 

 Production. M. B. Waite 187 



F. THE CONSERVATION OF NATURE'S AGRICULTURAL RESOURCES 



55. The Demand for Conservation of the Land. James J. Hill . 190 



56. A Defense of the Pioneer. F. A. Walker 194 



57. The Future Use of Land in the United States. Raphael Zon 199 



58. One Avenue of Escape Atmospheric Nitrogen. Thomas H. 

 Norton 205 



IV. HUMAN EFFORT AS A FACTOR IN AGRICULTURAL 

 PRODUCTION 



INTRODUCTION 210 



A. POPULATION AND THE LABOR SUPPLY 



59. The Supply of Farm Labor. George K. Holmes . . . . 212 



60. Natural Increase of the Rural Population 



a) In Early Times. T. R. Malthus 218 



6) At the Present Time. Edward Van Dyke Robinson . . 218 



61. The Rural Exodus. Roy Hinman Holmes 219 



62. The Back-to-the-Land Movement 221 







B. SOME SPECIAL CLASSES OF LABOR 



63. Immigration as a Source of Farm Laborers. John Lee Coulter 223 



64. Italians in Agriculture. Alexander E. Cance 228 



65. Asiatic Labor on the Pacific Coast. H. A. Millis . . .'. 232 



66. Statistics of Negroes in Agriculture. Bureau of the Census . 237 



67. Decline in Women's Work. George K. Holmes .... 242 



C. THE QUESTION OF EFFICIENCY 



68. What the Farmer Needs to Know. G. F. Warren ... 246 



69. Farming Demands Experience as Well as Knowledge. G. P. 

 Warren 247 



70. Machinery Not Entirely a Substitute for Labor. Carl W. 

 Thompson and G. P. Warber 248 



