. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. NECTAR OF FLOWERS 97 such flowers they disappear more or less completely in the double variety, where they have become mere useless markings. Insects are certainly attracted from a distance by these flowers, but as soon as they come near they notice that here there is nothing for them (for as a rule the formation of pollen and the secretion of nectar cease when flowers become double), and turn away without searching for Please note that these images a
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. NECTAR OF FLOWERS 97 such flowers they disappear more or less completely in the double variety, where they have become mere useless markings. Insects are certainly attracted from a distance by these flowers, but as soon as they come near they notice that here there is nothing for them (for as a rule the formation of pollen and the secretion of nectar cease when flowers become double), and turn away without searching for Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Knuth, Paul, 1854-1899; Knuth, Paul, 1854-1899; Mu?ller, Hermann, 1829-1883; Ainsworth Davis, J. R. (James Richard), 1861-1934. Oxford : Clarendon Press
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