Preface. 



The following leading Authorities, among others, have been consulted 

 in the preparation of this work. 



1. Dr. Maercker, Government Privy Councillor, German Agricultural 



Association. 



2. Fertilizer Experiments ; Colorado Agricultural Experiment Station, 



Abstract of Bulletin No. 115, by A. H. Danielson. 



3. Sugar-Beet Investigations / Michigan Agricultural Experiment Station, 



Bulletin No. 179, by J. D. Towar. 



4. Effect of Each Class of Fertilizer ; Nebraska Agricultural Experiment 



Station, Extract from Bulletin No. 73. 



5. Fertilizers for the Sugar-Beet ; from "The American Sugar -Beet 



Industry" 1906. 



6. Sugar-Beet Investigations; Ohio Agricultural Experiment Station, 



Bulletin No. 132. 



7. Progress of the Beet Sugar Industry in America; from Report 



No. 80, Bureau of Plant Industry, United States Department of 

 Agriculture. C. O. Townsend. 



8. Experiments with Nitrate of Soda ; by Dr. Paul Wagner. 



9. Farmers' Bulletin No. 52, United States Department of Agriculture. 



New York, January, 1907. 



274380 



