. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. A RIS TOL OCHIA CEAE 351 states that three parts may be distinguished in them—the base, the joint, and the hair proper. The root of each hair is situated in a shallow depression of the perianth and its basal cell is thick-walled. The joint, by means of which the hair bends, is formed by one very thin-walled cell. The strength necessary for bearing the hair is supplied by the hydrostatic pressure, which Corren showed to reach not less than 22 atmospheres. The
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. A RIS TOL OCHIA CEAE 351 states that three parts may be distinguished in them—the base, the joint, and the hair proper. The root of each hair is situated in a shallow depression of the perianth and its basal cell is thick-walled. The joint, by means of which the hair bends, is formed by one very thin-walled cell. The strength necessary for bearing the hair is supplied by the hydrostatic pressure, which Corren showed to reach not less than 22 atmospheres. The hair itself consists of several thin-walled, plate-like cells. In this case also the needful firmness is due to a high degree of turgidity (up to 15 atmospheres). The hair, which in its normal position is directed obliquely down- wards against the pit, is depressed still further by a small insect forcing its way in, and enabling it to pass on. The hair then springs back into its original position. An insect is prevented from creeping out again by a barrier (observed byHildebrand), formed by a knob on the base of the hair, which is directed upwards and im- pinges against the wall of the perianth. This barrier, however, is an imperfect one, for the knob only touches the perianth at one point, so that an oblique pressure can. 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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