10. Ross, J. B. — The Agrarian Revolution in the 



Middle West, in The North American Reviezv, 

 Vol. 190, 1909, pp. 376-391. 

 Agrarian Changes in the Middle West, in The 

 Political Science Quarterly, Vol. XXV, 1910, 

 pp. 625-637. 



11. Sanford, A. H. — The Story of Agriculture in the 



United States, 1915, Chapters XVII, XVIII, 

 XIX, XX, XXI, XXII. 



12. Sparks, E. E. — National Development in The 



American Nation^ Vol. XXIII, 1907, Chap- 

 ter II. 



13. Thornton, W. B. — Revolution by Farm Ma- 



chinery, in The World's Work, Vol. Vl, pp. 

 3766-3779. 



14. Quaintance, H. W. — The Influence of Farm Ma- 



chinery on Production and Labor, in Publica- 

 tions of the American Economic Association, 

 Third Series, Vol. V, No. 4, November, 1904, 

 pp. 1-103. Reprinted with omissions in Car- 

 ver's Selected Readings in Rural Economics, 

 pp. 32-100. 

 The Influence of Machinery on the Economic 

 and Social Conditions of the Agricultural Peo- 

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 culture, Vol. IV, *1909, pp. 108-113. 



15. Wright. C. D. — Industrial Evolution of the 



United States, 1897, Chapter XII. 



16. Wright, C. \Y .—Wool-Grotcing and the Tariff, 



in Harvard Economic Studies, Vol. V (1910), 

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17. Encyclopedia Britannica (Eleventh Edition). 



Vol. I, pp. 414-421. On agriculture in the 

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18. Appleton's Annual Cyclopedia, 1861-1902. Ap- 



pears under the title of American Annual 

 Cyclopedia for 1861 to 1875. 



19. Bailey's Cyclopedia of American Agriculture, 



Vol. IV, 1909, Chapters V, VI, VII, VIII, IX. 

 62 



