By Charles Darwin
During this vintage Darwin essay on botany Darwin states, "during the summer season of 1860, i used to be stunned via discovering how huge a few bugs have been stuck through the leaves of the typical sun-dew (Drosera rotundifolia) on a heath in Sussex. I had heard that bugs have been therefore stuck, yet knew not anything extra at the subject."
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Extra info for Insectivorous plants
Sample text
Bits of contract, whereas, if not thus held, they have no such power, I tried tides, gome experiments with great a boiled egg, cut with a knife \\hich had been washed in boiling water, also acted lik any othei animal substance. I breathed on some leaves for above a minute, and repeated the act two or three care, but the results did not confirm Eed-hot cinders \vere taken out of the fire, and bits this belief. of glass, cotton-thread, blotting and thin slices of cork immersed in boiling water; paper v, ere 3 times, with my month close to DROSEKA EOTUNDIFOLIA.
Anyone who has rubbed precipitated chalk between his fingers will have perceived how excessively fine the powder is. No doubt there must be a limit, beyond which a particle would be too small to act on a gland but what this limit is, I know not. I have often seen fibres and dust, which had fallen from the air, on the glands of plants kept in my room, and these never induced any movement but then such particles lay on the surface of the secretion and never reached the ; ; ; gland itself. -g-'-r-g- of a grain (000822 milligramme), or particles of precipitated chalk, after resting for a short time on a gland, should induce some change in its cells, exciting them CHAP.
This leaf, therefore, was not much or at all injured by an immersion for this length of time in the above solution of two grains to the ounce and on being afterwards left for 24 hrs. in water, the aggregated masses in many of the cells were redissolved, in the same manner as occurs with leaves in a state of ; nature when they re-expand after having caught insects. In a leaf which had been left for 22 hrs. in a solution of one part of the carbonate to 292 of water, some spheres of protoplasm (formed by the self-division of a bag-like mass) were gently pressed beneath a covering glass, and then examined under a high power.