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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.
A loop of thread weighing 0.125th of a grain caused a petiole to curve; but the stimulus was not sufficient, the loop remaining suspended, to cause a permanent flexure. If a much heavier loop be placed in the angle between the petiole and the stem, it produces no effect; whereas we have seen with Clematis montana that the angle between the stem and petiole is sensitive. Tropaeolum peregrinum.
"Quere peregrinum, vicinia rauca reclamat;" and if the peregrinus happens to be young and verdant, and, having just been given a good appointment, feels, with the Vicar of Wakefield, that one of the three greatest characters on earth is the father of a family, he is possibly hooked securely before he discovers his danger.
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