The behavior and pollination effectiveness of honey bees,Apis melliferaL., were studied in an enclosed environment.Four groups of melon plants,Cucumis meloL., were grown in an inflated polyethylene greenhouse and exposed for variable times to bee pollination. Blooms were shielded from bee visits with gelatin capsules.Plant blooms shielded from bees during the entire experiment produced no edible melons. The production of plants with blooms exposed for various times did not vary significantly. Seed counts, percent soluble solids, and weights of melons indicated adequate pollination. Variable carbon dioxide concentrations within the greenhouse appeared to affect the soluble solids percentages in mature melons. Bee activity was enhanced by the presence of supplemental pollen cake.