Report on the progress of physiological botany during the year 1841 / by H.F. Link. Translated by E. Lankester.

  • Heinrich Friedrich Link
Date:
[1845]
Catalogue details

Licence: Public Domain Mark

Credit: Report on the progress of physiological botany during the year 1841 / by H.F. Link. Translated by E. Lankester. Source: Wellcome Collection.

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    observed. Tlie effect upon the Algce was much slighter, and only Sphcerococcus ciliatus, Ulva linza, and U. lactuca, assume a blue colour. The author further instituted re¬ searches respecting the horn-like albumen-cells ; first, of those of Monocotyledons, when he found the four following principal modifications:—a. Albumen-cells, which are coloured yellow by diluted tincture of iodine, becoming yellowish-brown upon being dried, and which assume their former yellow colour again on being moistened, and which, in fact, behave them¬ selves in quite the same manner as the common woody tissue. This takes place, as far as the author investigated, with the albumen of all Palms, for instance, with Rhapis acaulis, Manicaria saccifera, &c. h. Albumen-cells, which exhibit first a yellow, subsequently a brown colour with an admixture of violet, upon the action of iodine, which become clearer or darker yellow-brown upon being dried; and upon being soaked again, become violet, with a brown admixture; as Iris pratensis, atomaria. Allium glohosum, odorum, sihiri- cum, Asphodelus luteus, Antliericum ramosum, Czachia liliastrum, Eucomis punctata, c. Albumen-cells, which, upon the action of iodine, become first yellow, then brown, finally dirty violet; when dried, red-brown; when soaked again, violet, with a partial transition to deep violet blue; as Iris aurea. Asparagus dauricus, maritimus, Scilla peru¬ viana, Hyacinthus romanus, amethystinus, Lilium hulbi- ferum, Tigridia pavgnia, Convallaria racemosa. Yucca gloriosa. d. Albumen-cells, which, by the application of iodine, are coloured with a lively violet; when dry, red brown; soaked again, beautifully violet or deep violet blue. Ixia liyalina, squalida. Gladiolus tristis, Ruscus racemosus, Veit- heimia viridifolia. The author has investigated, with less care, the seed of Dicotyledons with horn-like albumen, because the phenomena, as far as he observed them, were the same as in the Monocotyledonous plants. Caustic potass acts, accord¬ ing to the author, very considerably upon those albumen-cells which become coloured blue by the application of iodine. Those upon which the alkali acted most slightly, were fur¬ nished with considerably thicker walls. It was distinctly 4:01 2 C *
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