The microscope and its revelations . hisdeposit, is its extension over the submarine flanks of MountErebus, an active volcano of 12,400 feet elevation; since acommunication betweeu the ocean-waters and the bowels of avolcano, such as there are other reasons for believmg to be of illustrations which have been executed for it by ilr, Tuffen West, many ofthem still unpublished. All the fii,ures of Diatomacese, given in this Manual,except Figs. 80 and 85, which are drawn from nature, and Figs. 101,102, whichare copied fi-om Prof. Ehrenberg, are as exact copies of Mr. Wests lithographsas the best W
The microscope and its revelations . hisdeposit, is its extension over the submarine flanks of MountErebus, an active volcano of 12,400 feet elevation; since acommunication betweeu the ocean-waters and the bowels of avolcano, such as there are other reasons for believmg to be of illustrations which have been executed for it by ilr, Tuffen West, many ofthem still unpublished. All the fii,ures of Diatomacese, given in this Manual,except Figs. 80 and 85, which are drawn from nature, and Figs. 101,102, whichare copied fi-om Prof. Ehrenberg, are as exact copies of Mr. Wests lithographsas the best Wood-engraving can produce. 334 MICEOSCOPIC POEMS OF VEGETABLE LIEE. occasionally formed, would account for tlie presence of Dia-tomaceee in volcanic aslies and pumice, wliich was discoveredby Prof. Ehrenberg, It is remarked by Dr. Hooker, that theuniversal presence of this invisible vegetation throughout theSouth Polar Ocean, is a most important feature; since thereis a marked deficiency, in this region, of higher forms of Fig. Fossil Diatomacece, &c. from Gran:—a, a, a, Coscinodiseus; b, b, b,Actinocyclus; c, Dictyochya lihula; d, Lithasteriscus radiatus; e,Spongolithis acieularis; /,/, Grammatophora parallela (side view);ff, g, Grammatophora angxilosa (front view). vegetation; and were it not for them, there would neither befood for aquatic animals, nor (if it were possible for these tomaintain themselves by preying on one another) could theocean-waters be purified of the carbonic acid which animalresj)iration and decomposition would be continually impartingto it.—It is interesting to observe, that some species of DIATOilACEJE :—FOSSILIZED DEPOSITS. 335 marine Diatomacese are found tlirough every degree of lati-tude between Spitzbergen and Yictoria Land; wliilst othersseem limited to particular regions.—One of the most singularinstances of the preservation of Diatomaceous forms, is theirexistence in Guano; into which they must have passed fromthe intestinal cana
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