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The petioles which have clasped some object become much more stiff, hard, and polished than those which have failed in this their proper function. TROPAEOLUM. I observed T. tricolorum, T. azureum, T. pentaphyllum, T. peregrinum, T. elegans, T. tuberosum, and a dwarf variety of, as I believe, T. minus. Tropaeolum tricolorum, var. grandiflorum.
The petioles of the young leaves are very sensitive: a single light rub with a twig caused one to move perceptibly in 5 m., and another in 6 m. The former became bent at right angles in 15 min., and became straight again in between 5 hrs. and 6 hrs. A loop of thread weighing 0.125th of a grain caused another petiole to curve. Tropaeolum pentaphyllum.
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