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REFERENCES

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  • Butler, C. G. (1945). The influence of various physical and biological factors of the environment on honey-bee activity. J. exp. Biol. 21, 512.
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  • Hyde, H. A. & Williams, D. A. (1945). Pollen of Lime (Tilia spp.). Nature, Loud., 155, 457.
  • Percival, M. S. (1946). Observations on the flowering and nectar secretion of Rubus fruticosus (Agg.). New Phytol. 45, III.
  • Todd, F. E. & Bishop, R. K. (1941). Trapping honey bee gathered pollen and factors affecting yields. J. Econ. Ent. 33, (6), 866.
  • Vansell, J. H. (1942). Factors affecting the usefulness of honey bees in pollination. Circ. U.S. Dep. Agric. no. 650.
  • Yate–Allen, M. (1937). European Bee Plants and their Pollen. Alexandria , Egypt .