World-life; or, Comparative geology . iscretecondition. Such is the nebula or cluster in Hercules. Even the separatemasses of a curdling nebula must sooner or later rotate. SPHERATTON^ OF RIKGS. 119 ration of the ring into two or many concentric rings(Figure 30). The stratified condition might also arise, asKant first suggested, from the different velocities of theouter and inner portions of a broad ring progressivelydisengaged. It is also quite conceivable that every annu-lar mass, separated aftera secular interval, shouldconsist originally of dif-ferential annuli droppedoff in small consecut
World-life; or, Comparative geology . iscretecondition. Such is the nebula or cluster in Hercules. Even the separatemasses of a curdling nebula must sooner or later rotate. SPHERATTON^ OF RIKGS. 119 ration of the ring into two or many concentric rings(Figure 30). The stratified condition might also arise, asKant first suggested, from the different velocities of theouter and inner portions of a broad ring progressivelydisengaged. It is also quite conceivable that every annu-lar mass, separated aftera secular interval, shouldconsist originally of dif-ferential annuli droppedoff in small consecutiveelements of time. These,if ever existing, which isnot probable, must nat-urally experience a strong-tendency to coalescence ingroups, at the same timethat their different angu-lar velocities might resistthe coalescence together of rings differing much in diameter. Be the cause ofstratification what it may, it seems to be at least an oc-casional incident of nebular life. A persistent example isactually noted in the rings of Fig 30.—Stratification of a Nebulous EiNG. § 4. SPHERATION OF RINGS. 1. Disruption of a Ming.—Sooner or later, externalperturbations or actual collisions must generally result inthe breaking up of a nebulous ring. In some instancesperturbation would develop undulations which, continu-ally exaggerated, would finally produce rupture, or destroythe equal distribution of matter around the ring. Anincrease of mass on one side, however caused, woulddraw still other matter toward it. The ring on the oppo-site side would become slender (Figure 31), and would 120 KEBULAR LIFE.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherchica, bookyear1883
