Contents

07 June 1985
Vol 228, Issue 4704

About The Cover

(Left) The leaves of the Madagascar periwinkle (Catharanthus roseus) yield the anticancer drugs vincristine and vinblastine. [T. E. Hemmerly, Middle Tennessee State University, Murfreesboro; reproduced with the permission of Carolina Biological Supply Company, Burlington, North Carolina] (Center) Pyrethrum (Chrysanthemum cinerariaefolium) flower heads yield commercially important pyrethrin insecticides. [W. H. Bollinger, NPI, Salt Lake City, Utah] (Right) The berries of the chinaberry tree (Melia azedarach) yield insectidal limonoid compounds such as azadirachtin. [J. R. Martineau, NPI, Salt Lake City, Utah] See page 1154.