CYRIL GEORGE HOPKINS 



Plant Food in Relation to Soil Fertility. Science, n.$., vol. 36, p. 616. 

 Some Economic History of the Original Thirteen States. /. H. C. 



Almanac, p. 28. Pub. by The International Harvester Co. 

 Soil Improvement and Permanent Agriculture for New England. Pub. 



by Vermont Marl Co. 



1913 The Illinois System of Permanent Fertility. ///. Agr. Exp. Sta. Circ. 



167. Also Rpt. 111. Farmers' Inst., vol. 18, p. 90. 

 Bread from Stones. ///. Agr. Exp. Sta. Circ. 168. 

 LaSalle County Soils. (With J. G. Mosier, J. H, Pettit, and J. E. 



Readhimer) ///. Agr. Exp. Sta. Soil Rpt. 5. 

 Knox County Soils. (With J. G. Mosier, J. H. Pettit, and J. E. 



Readhimer) ///. Agr. Exp. Sta. Soil Rpt. 6. 

 McDonough County Soils. (With J. G. Mosier, J. H. Pettit, and O. S. 



Fisher) ///. Agr. Exp. Sta. Soil Rpt. 7. 

 Bond County Soils. (With J. G. Mosier, J. H. Pettit, and O. S. 



Fisher) ///. Agr. Exp. Sta. Soil Rpt. 8. 

 The Farm That Won't Wear Out. Pub. by the author. 

 The Use of Commercial Fertilizers. The Illinois Agriculturist, vol. 



17, No. 4. 



National Problem. The Illinois Agriculturist, vol. 19, No. 9. 

 Facts and Fictions about Crops. Science, n.s., vol. 37, p. 470. 

 The Bread Supply. Science, n.s., vol. 38, p. 479. 

 Illinois System of Permanent Fertility. Pub. by American Steel and 



Wire Co. 

 Saving the Soil. Pub. by The Dollar Savings & Trust Co. 



1914 Permanent Soil Fertility. Rpt. III. Farmers' Inst., vol. 19, p. 24. 



The Illinois System of Permanent Fertility. Popular Science Monthly, 

 84, No. 1, p. 52. 



Ground Limestone for Southern Soils. Farm Truth 1, Southern Settle- 

 ment and Development Organization. 



Soil Fertility the Greatest Necessity and the Best Investment. Amer- 

 ican Bankers' Assoc., vol. 40, p. 199. 



Agriculture's Pressing Need. The Banker Farmer, vol. 1, No. 10, p. 2. 



Soil Fertility in Relation to General Prosperity. Rpt. 44th. Ann. Meeting 

 Vermont Dairymen's Assoc., p. 74. 



Address (title not given). Rpt. 44th Ann. Meeting Vermont Dairy- 

 men's Assoc., p. 38. 



1915 Radium as a Fertilizer. (With Ward H. Sachs) ///. Agr. Exp. Sta. 



Bui. 177. 

 Potassium from the Soil. (With J. P. Aumer) ///. Agr. Exp. Sta. 



Bui. 182. 

 How Not to Treat Illinois Soils. ///. Agr. Exp. Sta. Circ. 181. Also 



Rpt. III. Farmers' Inst., vol. 20, p. 20. 

 Lake County Soils. (With J. G. Mosier, E. Van Alstine, and F. W. 



Garrett) ///. Agr. Exp. Sta. Soil Rpt. 9. 



