. The carnivorous plants, by Francis Ernest Lloyd ... Carnivorous plants. Francis E. Lloyd — 142 Carnivorous Plants As little indeed may one thus argue as about the nutritional value of food taken by man from the action of the salivary glands, adds ScHMED. It seems proper to conclude that the reactions of the ten- tacles are general rather than specific. The length of time they remain inflected, however, seems, in the absence of injury (several times noted by Darwin) to be generally correlated with their opportunity for ab- sorption. Mechanism of tentacle movement. — Nitschke pointed out that
. The carnivorous plants, by Francis Ernest Lloyd ... Carnivorous plants. Francis E. Lloyd — 142 Carnivorous Plants As little indeed may one thus argue as about the nutritional value of food taken by man from the action of the salivary glands, adds ScHMED. It seems proper to conclude that the reactions of the ten- tacles are general rather than specific. The length of time they remain inflected, however, seems, in the absence of injury (several times noted by Darwin) to be generally correlated with their opportunity for ab- sorption. Mechanism of tentacle movement. — Nitschke pointed out that al- though the tentacles can bend, there are no special motile organs, such as occur in Mimosa. What then is the nature of the bending movements of the tentacle? Though Darwin obtained no hght on this question, it was answered by Batalin (1877). He made spaced marks on the sides of the tentacle, and found that after a movement was com- pleted, the distances had increased. When the recovery is complete, these distances are maintained, showing that the bending is a growth phenomenon. This was shown true also of the leaf blade. H. D. Hooker (1916) investigated the matter more thoroughly. In making. Fig. 3. — Drosera rotundifolia. — A, Side views of a tentacle in process_ of bending, beginning with the bottom figure; B, same in process of unbending, beginning with the top figure; C, Side views of the same tentacle before and at close of the reaction (after Hooker). his measurements of the tentacles during bending he made use of natural marks supplied by the minute sessile glands to be found on the surface of the tentacle stalk. By means of these measurements and of camera lucida drawings, he got a detailed record of changes in dimen- sions during bending and recovery. A set of his drawings are here re- produced (Text fig. 3). Hooker found, as did Batalin, that the movement, whether bending or unbending, is a growth phenomenon. During bending acceleration of growth begi
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