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anthers apple arise Association of Bee-keepers attract average bean bee visitation beneath blossoms body building bumble-bee Capillary CENTRAL ASSOCIATION collecting compounds concentration contain crop depends partly e.g. dandelion Effect of Temperature energy evaporation evolved floral axis fodder forage fructose glucose glucosides green hairy hich honey igars increase insect inverted ipply istead Kleber leaf LECTURE GIVEN lime ling liquid lucerne membership Minerals minutes Miss molecules narrow nectar secretion nectar-chamber nectar-gatherers older flowers organs ovary pear Pedersen period of secretion peta petals phloem pistillate plant Poland pollen gatherers pollination extends preference prevention of pollination primula proboscis production protein reabsorbed reach the nectar receptacle red clover reproductive reserve rise scent secrete Nectar seed shady side showed stalk stamens and stigma sucrose sugar sunny supply surplus tetraploid tobacco touch trip tube utilisation variety verified weaker white clover Withers xylem yield