Harper's New Monthly Magazine Volume 104 December 1901 to May 1902 . llions of these little ornamentshave been created since the beginningof all things on this earth, unknown tous. Diatoms are unicellular plants, foundin abundance in running streams andponds. In them the silica which coatsthe stalks of straw with a thin and brit-tle glassy veneer takes the shape of beau-tiful valves of every imaginable form,covered with the finest tracings andmarks. A few of them are shown inPlate E. They have existed, and theirvalves or frustules have been deposited,from time immemorial; and strangethough it
Harper's New Monthly Magazine Volume 104 December 1901 to May 1902 . llions of these little ornamentshave been created since the beginningof all things on this earth, unknown tous. Diatoms are unicellular plants, foundin abundance in running streams andponds. In them the silica which coatsthe stalks of straw with a thin and brit-tle glassy veneer takes the shape of beau-tiful valves of every imaginable form,covered with the finest tracings andmarks. A few of them are shown inPlate E. They have existed, and theirvalves or frustules have been deposited,from time immemorial; and strangethough it may seem, their duty in lifehas been to furnish stone wherewith tobuild our houses. Plate F is a curiosity in its way. shows a diatom called Pleurosigmaformosum, very much magnified, and shows a broken portion of a valve orfrustule, magnified a few million beads on it are the subject of a livelycontroversy amongst the learned in suchmatters. Appearances are so deceptivein high magnification that it has notbeen made out as yet, although for many.
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