 | 1849 - 428 페이지
...these plants are composed are called frustules ; and each frustule consists of a single cell, whose coat is composed of a very delicate membrane made...waters of the sea, as well as in lakes and ponds. * Ralfs on British Desmideae. London, 1848. Thirty.five coloured plates. 160 On Oceanic Infusoria,... | |
 | William Henry Harvey - 1849 - 270 페이지
...most wonderful. Ceaselessly, from the earliest ages of the world, have they gone on, withdrawing lime from the waters of the sea, and fixing it in their tissues, till not mountains or islands merely, but whole continents have been formed by their debris. In the... | |
 | 1850 - 638 페이지
...Lancet, Nov. 2, 1833). The remarkable power which some living beings possess of withdrawing silica from the waters of the sea and fixing it in their tissues, is well illustrated in the minute beings called diatomacete. These creatures feed on flint, and have siliceous... | |
 | William Henry Harvey - 1854 - 350 페이지
...from the earliest ages of MODERN BRITISH CORALS. 125 the world, have they gone on, withdrawing lime from the waters of the sea, and fixing it in their tissues, till not mountains or islands merely, but whole continents have been formed by their debris. In the... | |
 | 1886 - 562 페이지
...often most elaborately sculptured. These plants have the power of withdrawing silex, or flintearth, in some manner from the waters of the sea and fixing it in their tissues, but the exact method in which this is effected has not been ascertained. A remarkable point in their... | |
 | Henry Coppée - 1896 - 546 페이지
...often most elaborately sculptured. These plants have the power of withdrawing silex, or flintearth, in some manner from the waters of the sea and fixing it in their tissues, but the exact method in which this is effected has not been ascertained. A remarkable point in their... | |
 | 1850 - 632 페이지
...Lancet, Nov. 2, 1833). The remarkable power which some living beings possess of withdrawing silica from the waters of the sea and fixing it in their tissues, is well illustrated iu the minute beings called dialomacea. These creatures feed on flint, and have siliceous... | |
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... but the exact method in which this is effected has not been ascertained. A remarkable point in their history results from this power of feeding on flint. It is this : their bodies are indestructible. Thus their... 