Cotton. Miscellaneous papers: United States official cotton grades, [by] N. A. Cobb; Potato leaf-roll, [by] W. A. Orton; Morphology of cotton branches, [by] O. F. Cook; Wilting coefficient for plants in alkali soils, [by] T. H. Kearney; Interpreting variation of plat yields, [by] F. D. Farrell.