BULIiETINS OF THE BTJREAU OF PLANT INDUSTRY. 



The Bureau of Plant Industry, which was organized July 1, 1901, includes Vege- 

 table Pathological and Physiological Investigations, Botanical Investigations and 

 Experiments, Grass and Forage Plant Investigations, Pomological Investigations, and 

 Experimental Gardens and Grounds, all of which were formerly separate Divisions, 

 and also Seed and Plant Introduction and Distribution, the Arlington Experimental 

 Farm, Tea Culture Investigations and Domestic Sugar Investigations. 



Beginning with the date of organization of the Bureau, the several series of bulle- 

 tins of the various Divisions were discontinued, and all are now published as one 

 series of the Bureau. ' A list of the bulletins issued in the present series follows. 



Attention is directed to the fact that "the serial, scientific and technical pubUca- 

 tions of the United States Department of Agriculture are not for general distribution. 

 All copies not required for official use are by law turned over to the Superintendent 

 of Documents, who is empowered to sell' them at cost." All applications for such 

 publications should, therefore, be made to the Superintendent of Documents, Union 

 Building, Washington, D. C. 



No. 1. The Relation of Lime and Magnesia to Plant Growth. I. Liming of Soils 

 from a Physiological Standpoint. II. Experimental Study of tlie Relation of Lime 

 and Magnesia to Plant Growth. 1901. Price, 10 cents. 



No. 2. Spermatogenesis and Fecundation of Zamia. 1901. Price, 20 cents. 



No. 3. Macaroni Wheats. 1901. Price, 20 cents. 



No. 4. Range Improvement in Arizona. (Cooperative Experiments with__ 4he 

 Arizona- Experiment Station.) 1902.. Price, 10 cents. ' '- 



No. 5. Seeds and Plants Imported Through the Section of Seed and Plant Intro- 

 duction for Distribution in Cooperation with the Agricultural Experiment Stations. 

 Inventory No. 9, Numljers 4351-5500. 1902. Price, 10 cents. 



No. 6. "A List of American Varieties of Peppers. 1902. Price, 10 cents. 



No. 7. The Algerian Durum Wheats: A Classified List, with Descriptions. 1902. 

 Price, 15 cents. 



No. 8. A Collection of Economic and Other Fungi Preparer! for Distribution. 1902. 

 Price, 10 cents. 



No. 9. The North American Species of Spartina. 1902. Price, 10 cents. 



No. 10. Records of Seed Distribution and Cooperative Experiments with Grasses 

 and Forage Plants. 1902. Price, 10 cents. 



No. 11. Johnson Grass: Report of Investigations Made During the Season of 1901. 

 1902. Price, 10 cents. 



No. 12. Stock Ranges of Northwestern California. Notes on the Grasses and Forage 

 Plants and Range Conditions. 1902. Price, 15 cents. 



No. 13. Experiments in Range Improvements in Central Texas. 1902. Price, 10 



No. 14. The Decay of Timber and Methods of Preventing It. 1902. Price, 55 cents. 



No. 15. Forage Conditions on the Northern Border of the Great Basin, Being a 

 Report upon Investigations Made During July and August, 1901, in the Region 

 Between Winnemucca, Nevada, and Ontario, Oregon. 1902. Price, 15 cents. 



No. 16. A Preliminary Study of the Germination of the Spores of Agaricus Campes- 

 tris and Other Basidiomvcetous Fungi. 1902. Price, 10 c^nts. 



No. 17. Some Diseases of the Cowpea: I. The Wilt Disease of the Cowpea and 

 Its Control. II. A Cowpea Resistant to Root Knot (Heterodera radicicola). 1902. 

 Price, 10 cents. 



No. 18. Observations on the Mosaic Disease of Tobacco. 1902. Price, 15 cents. 



No. 19. Kentucky Bluegrass Seed: Harvesting, Curing, and Cleaning. 1902. Price, 

 10 cents. 



No. 20. Manufacture of Semolina and Macaroni. 1902. Price, 15 cents. 



No. 21. List of American Varieties of Vegetables for the Years 1901 and 1902. 1903. 

 Price, 35 cents. 



[Continued on page 3 of cover.] 



