Apidologie no 6/90 has just been issued. Here is its contents: 1) huang z.Y., OTIS G.W., TEAL P.E.A. Nature of brood signal activating the protein synthesis of hypopharyngeal gland in honey bees Apis mellifera pp. 455-464 University of Guelph, Department of Environmental Biology Guelph Ontario N1G 2W1 (Canada) 2) PUNNETT E.N., WINSTON M.L. A comparison of package and nucleus production from honey bee colonies pp. 465-472 Simon Fraser University, Department of Biological Sciences Burnaby B.C. V5A 1S6 (Canada) 3) MOLZAHN D., KLEPSCH A., ASSMANN-WERTMULLER U. Transfer of radioactive cesium from soil to rape plants, rape blossoms and rape honey pp. 473-483 (in German, English detailed summary) Kernchemie im Fachbereich Physikalische Chemie, Philipps Universitat Marburg D-3575 Kirchhain (GFR) 4) KEVAN P.G. How honey bees forage for pollen at skunk cabbage Symplocarpus foetidus (Araceae ) pp.485-490 University of Guelph, Department of Environmental Biology Guelph Ontario N1G 2W1 (Canada) 5) Proceedings of the Working Group of the Apicultural Institutes in Western Ger many 5/7 October 1988 pp. 491-531