Tulpen vanitas

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Some essential oils, both in solution and in vapour, cause rapid inflection, others have no such power; those which I tried were all poisonous.

Diluted alcohol (one part to seven of water) is not poisonous, does not induce inflection, nor increase the sensitiveness of the glands to mechanical irritation. The vapour acts as a narcotic or anaesthetic, and long exposure to it kills the leaves.

[txt: Charles Darwin - Insectivorous Plants]