Part I. Pollination Studies of Seed Production Part Part I. POLLINATION STUDIES OF SEED PRODUCTION. Part II. STRUCTURE AND CHEMICAL NATURE OF THE SEED COAT AND UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 844 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief Washington, D. C. PROFESSIONAL PAPER August 11, 1920 SWEET-CLOVER SEED |