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Show World Development. The hypothesis of world development develop-ment from spiral nelml'ie, which was no widely dlurusioil about 20 years ago, hut which of Lite years has been seriously questioned, has been strengthened somewhnt recently by tlia explanation that worlds are formed not hy tho condensation of rings gradually, solidified fioin tenuous tenu-ous nobulao, hut rather by groat masses thrown oft or detached from Hio parent mans of a nebula by, tho contrifugal force of the rotation. I'hotKraphi of nebulae HIhcUijo such masses la process nt detachment, aul most astronomers urn now Incllnod to tho belief thut this Is tho way In which all planetary bodies havo been formed. Tho heavens show thousands of splml nehulao which aro ovldontly la a Btate of rotation In eentrnl nuclei, and which Indicate that they will probably bo consolidated Into sunn and solar systems similar to our own, |