. Experimental morphology. Protoplasm; Growth. §2] UPON THE DIRECTION OF GROWTH 341 by a fine needle point. The solutions were injected into the leaf of Tradescantia, spores were sown upon its stoma-bearing surface, and the whole was kept in a moist chamber. If the solution was attractive, the growing hyphse penetrated into the stomata, whereas in the absence of the solution they showed no tendency to do so. Similarly, spores sown on the perforated plate sent hyphse downwards through the holes when the plate was floating on attractive solutions, but not otherwise. Mole-. FiG. 94. — Upper figur
. Experimental morphology. Protoplasm; Growth. §2] UPON THE DIRECTION OF GROWTH 341 by a fine needle point. The solutions were injected into the leaf of Tradescantia, spores were sown upon its stoma-bearing surface, and the whole was kept in a moist chamber. If the solution was attractive, the growing hyphse penetrated into the stomata, whereas in the absence of the solution they showed no tendency to do so. Similarly, spores sown on the perforated plate sent hyphse downwards through the holes when the plate was floating on attractive solutions, but not otherwise. Mole-. FiG. 94. — Upper figure : Piece of the under side of a leaf of Tradescantia discolor injected with 2% ammonium chloride, and sown with spores of Mucor stolonifer. The young hyphse show chemotropic turnings, and have eventually penetrated into the stomata. Drawn 27 hours after sowing the spores; magnified 100. Lower figure: Penicillium glaucum growing on a leaf of Tradescantia, which has been injected with a 2% solution of cane sugar. The hyphs have branched, and the branches have penetrated into the stomata. Drawn 25 hours after sowing the spores; magnified 70. (From MrroSHi, '94.) cules diffusing out from the solution through the openings determine the direction of the growing hyphse, so that from all directions hyphse grew radially towards the openings in the membranes (Fig. 94). To prove that the result gained was truly chemotropism, and not something else, a series of experiments was made. That it was not a response to gravity was shown by sowing the spores below as well as on top of a leaf ; that it was not a response to light or moisture was shown by keeping the cult-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davenport, Charles Benedict, 1866-1944. New York, The Macmillan company; London, Macmillan & co. , ltd
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1897
