ACKNOWLEDGMENTS
Reading edition
In preparing this work, the chief sources of information beyond the author's experience and observation have been the bulletins issued by the various experiment stations in the United States and discussions in the Agricultural Press.
For the illustrations the author is indebted to Professor A. M. Soule of the experiment station of Tennessee, Professor H. H. Hume of the experiment station of Louisiana and Mr. W. T. Shaw of the experiment station of Oregon.