342 COSMOS. 



manifold currents and gyratory movements we add the phb 

 riomena of endosmosis, nutrition, and growth, we shall have 

 some idea of those forces which are ever active arnid the ap 

 parent repose of vegetable life. 



Since I attempted in a former work, Ansichtcn dcr Naiut 

 (Views of Nature), to delineate the universal diffusion of life 

 over the whole surface of the Earth, in the distribution of 

 organic forms, both with respect to elevation and depth, our 

 knowledge of this branch of science has been most remarkably 

 increased by Ehrenberg's brilliant discovery " on microscopic 

 life in the ocean, and in the ice of the polar regions" a dis- 

 covery based, not on deductive conclusions, but on direct ob- 

 servation. The sphere of vitality, we might almost say, the 

 horizon of life, has been expanded before our eyes. " Not 

 only in the polar regions is there an uninterrupted develop- 

 ment of active microscopic life, where larger animals can no 

 longer exist, but we find that the microscopic animals collect- 

 ed in the Antarctic expedition of Captain James Ross exhibit 

 a remarkable abundance of unknown and often most beautiful 

 forms. Even in the residuum obtained from the melted ice, 

 swimming about in round fragments in the latitude of 70 10', 

 there were found upward of fifty species of silicious-shelled 

 Polygastria and Coscinodisca} with their green ovaries, and 

 therefore living and able to resist the extreme severity of the 

 cold. In the Gulf of Erebus, sixty-eight silicious-shelled Poly- 

 gastria and Phytolitharia, and only one calcareous-shelled Poly- 

 thalamia, were brought up by lead sunk to a depth of from 

 1242 to 1620 feet." 



The greater number of the oceanic microscopic forms hith- 

 erto discovered have been silicious-shelled, although the anal- 

 ysis of sea water does not yield silica as the main constituent, 

 and it can only be imagined to exist in it in a state of suspen- 

 sion. It is not only at particular points in inland seas, or in 

 the vicinity of the land, that the ocean is densely inhabited 

 by living atoms, invisible to the naked eye, but samples of 



filament, which commences an active spiral motion. The signification 

 of these organs is at present quite unknown ; they appear, from tho 

 researches of Nageli, to resemble the cell mucilage, or proto-plasma, 

 in composition, and are developed from it. Schleiden regards them aa 

 mere mucilaginous deposits, similar to those connected with the circu- 

 lation in cells, and he contends that the movement of these bodies ia 

 water is analogous to the molecular motion of small particles of organic 

 and inorganic substances, and depends on mechanical causes." Outline* 

 of Structural end Physiological Botany, by A. Henfrey, F.L.S., &c. 

 1848, p. 230 ?V 



