344 COSMOS. 



vegetable kingdom, on the contrary, acts upon our iniag-ination 

 by its; continued presence and by the magnitude of its forms ; 

 for the size of a tree indicates its age, and here alone age U 

 associated with the expression of a constantly renewed vigor.* 

 In the animal kingdom (and this knowledge is also the result 

 of Ehrenberg's discoveries), the forms which we term micro- 

 scopic occupy the largest space, in consequence of their rapid 

 propagation.! The minutest of the Infusoria, the Monadidse, 

 have a diameter w^iich does not exceed g-oVo^^^ of a line, and 

 yet these silicious-shelled organisms form in humid districts 

 subterranean strata of many fathoms in depth. 



The strong and beneficial influence exercised on the feelingg 

 of mankind by the consideration of the diflusion of life through- 

 out the realms of nature is common to every zone, but the im- 

 pression thus produced is most powerful in the equatorial re- 

 gions, in the land of palms, bamboos, and arborescent ferns, 

 where the ground rises from the shore of seas rich in mollusca 

 and corals to the limits of perpetual snow. The local distri- 

 bution of plants embraces almost all heights and all depths 

 Organic forms not only descend into the interior of the earth 

 where the industry of the miner has laid open extensive ex 

 cavations and sprung deep shafts, but I have also found snow 

 white stalactitic columns encircled by the delicate web of an 

 Usnea, in caves where m.eteoric water could alone penetrate 

 through fissures. Podurellse penetrate into the icy crevices of 

 the glaciers on Mount Hosa, the Grindelwald, and the Upper 

 Aar ; the Chionsea araneoides described by Dalman, and the 

 microscopic Discerea nivalis (formerly known as Protococ- 

 cus), exist in the polar snow as well as in that of our high 

 mountains. The redness assumed by the snow after lying on 

 the ground for some time was known to Aristotle, and was 

 probably observed by him on the mountains of Macedonia. J 



* Humboldt, Ansichten der Natur (2te Aiisgabe, 182G), bd. ii., s. 21. 



t On multiplication by spontaneous division of the mother-corpuscle 

 •and intercalation of new substance, see Ehveuberg, Von den jetzt Icben 

 ien Thierarten der Kreidebildung, in the Abhandl. der Berliner Akad. 

 der Wis8., 1839, s. 94. The most powerful productive faculty in na- 

 ture is that manifested in the Vorticellse. Estimations of the greates* 

 possible development of masses will be found in Ehrenberg's grea": 

 work, Die Infusionsthierchen als vollkommne Organismen, 1838, s. xiii , 

 xix., and 244. " The Milky Way of these organisms comprises the 

 genera Monaa, Vibi'io, Bacterium, and Bodo." The universality of life 

 is so profusely distributed throughout the whole of nature, that the small- 

 er Infusoria live as parasites on the larger, and are themselves i:i'hahit« 

 ed by others, s. 194, 211, and 512. 



t Aristot.. Hist. Animal., v. xi.x..p. 552. Bekk. 



