World-life; or, Comparative geology . ifpossessing an irregular and ex-tremely flattened shape, we maycontemplate, besides the generalcentre of gravity, the centres ofgravity of its different certain conditions in thecourse of cooling and shrinkage,a nebula may break up into y\q. 24. numerous pieces by a process Coagulating Nebula, or , ^ , . , Curdling Fire-mist. analogous to a coagulation and withdrawal of part from part (Figure 24), as is daily illus-trated in the patchy arrangement of the aqueous vaporswhich float in our atmosphere.* Under other condi- * Of a certain porlion
World-life; or, Comparative geology . ifpossessing an irregular and ex-tremely flattened shape, we maycontemplate, besides the generalcentre of gravity, the centres ofgravity of its different certain conditions in thecourse of cooling and shrinkage,a nebula may break up into y\q. 24. numerous pieces by a process Coagulating Nebula, or , ^ , . , Curdling Fire-mist. analogous to a coagulation and withdrawal of part from part (Figure 24), as is daily illus-trated in the patchy arrangement of the aqueous vaporswhich float in our atmosphere.* Under other condi- * Of a certain porlion of the nebula in Orion, the so-called Huygcnian region,Sir John Herschel writes as follows: I know not how to describe it better thanby comparing it to a curdling liquid, or a surface strewed over with flocks ofwool, or to the breaking up of a mackercT eky when the clouds of which itconsists begin to assume a cirrous appearance. It is not very unlike the mot-tling of the suns disk, only (if I may so express myself) the grain is much. 106 NEBULAR LIFE. tions, as we may reasonably suppose, liquefied moleculesmay gather about numerous partial centres of gravity (Figure 25), as was first sug-gested by Sir William Her-schel. In either case, as thecooling should proceed, acluster of luminous bodieswould come into existence,which would present the ap-pearance of a resolvablenebula. This is, perhaps, a Fig. 25.—Fokmatiox of Local -, ^ i , • n ^, . ^^ . mode ot evolution of non- rotatino- nebulae.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherchica, bookyear1883
