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  • These silicious bodies belong partly to the lowly vegetable organisms which are called Diatomaceae, and partly to the minute, and extremely simple, animals, termed Radiolaria.

    Autobiography and Selected Essays

  • The waters of the ocean, all along the borders of the icy barrier, produce in amazing abundance the family of water-plants named Diatomaceae.

    Wonders of Creation

  • Diatomaceae, living in a medium which may contain only one part in 10,000 by weight of dissolved silica, or even less than that amount, should be able to separate this substance to form their exquisitely ornamented frustules is one of the most striking facts in natural history, whether we regard it in its physiological or its chemical aspects.

    Scientific American Supplement, No. 595, May 28, 1887

  • At 13,000 feet occurs either some simple _Conferva_ or _Zygnema, _ it is doubtful which from the condition of the specimens; and at the same elevation, in the nearly dry bed of the stream which flows from the larger lake at Momay, amongst flat cakes, consisting of felspathic silt from the glaciers above, and the debris of Algae, and abounding in Diatomaceae, some threads of a _Zygnema.

    Himalayan Journals — Complete

  • Amongst the greater part of the Algae, from 4000 feet to 18,000 feet, various Diatomaceae occur, which will be best noticed in a tabular form, as follows; the specific name, within brackets, merely indicating the species to which they bear most resemblance: --

    Himalayan Journals — Complete

  • As regards the _Confervae, _ taking the word in its older sense, the species in the three are quite different, and even in respect of genera there is little identity, but amongst the _Diatomaceae_ there is no striking difference, except in those of the Behar springs where three out of the four did not occur elsewhere.

    Himalayan Journals — Complete

  • _Diatomaceae, _ and of the species of _Nostoc_ and _Hormosiphon, _ which occurred in great profusion, and under several forms, sometimes attaining a very large size (several inches across), especially in the districts of Le and Piti, and where the soil or waters were impregnated with saline matters.

    Himalayan Journals — Complete

  • As in the Southern Himalayan Algae, the specimens were infested with many Diatomaceae, amongst which the moat conspicuous were various _Cymbellae_ and _Epithemiae.

    Himalayan Journals — Complete

  • That dusty cloud which shakes off in the water as you move the weed, under the microscope would be one mass of exquisite forms -- Desmidiae and Diatomaceae, and what not?

    Prose Idylls, New and Old

  • Do you not think that the conjugation of the Diatomaceae will ultimately throw light on the subject?

    More Letters of Charles Darwin — Volume 1


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