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Show gravitational attraction be ' at work among the Pleiades? If it is,' we must suppose that they, too, . haye: bounds and orbits set and interwoven, revolutions revo-lutions and gyrations far more complex com-plex than the solar system knows. The visual discovery of such motion of rotation ro-tation among the Pleiades may be called one of the pressing problems of astronomy today. We feel sure that the time is ripe,' and that the discovery discov-ery is actually being made at the present pres-ent moment; for a generation of meu is not too great period to call a mo-. ment, when we have to deal with cos-mi cos-mi time. New York rPost THE FAMOUS PLEIADES. Why They Are Particularly Interesting to the Astronomers. .. The problems presented by the group ' 1 -' of stars known as the Plsiades- are among the most interesting in astron-' omy. It can have been no.mere chance that has massed them from among their fellow-stars. Men of ordinary eye-sight see but a half dozen distinct objects in the cluster; those of acuter Tlsion can count fourteen, but it is-not is-not until we apply the space-penetrating power of the telescope that we realize the extraordinary scale upon which the system of the Pleiades i constructed. With the Paris instrument instru-ment Wolf in 1876 catalogued 625 stars in the group; and the photographic survey of Henry in 1887 revealed no less than 2,326 distinct stars within end near the filmy, gauze of nebulous matter always so conspicuous a feature fea-ture of the Pleiades. The Pleiad stars , ere among those for which no meas,-urement meas,-urement of distance has yet been made, o that we do not know whether thej era all equally far away from us. W . . mat them projected on the dark background back-ground of the celestial vault; end can not tell from actual measurement whether they are all situated at the same point in space, but we may conclude con-clude on general principles that the gathering of so many objects into a single close assemblage denotes com- munity of origin and interests. The Pleiades then really belong to one another. an-other. -What is the nature of their mutual tie? What is their' mystery, and can we solve it? The most obvious ob-vious theory is, of course, suggested by what we know to be true within our own solar system. We owe to Newton New-ton the-beautiful, conception of gravitation, gravi-tation, that unique law by' means' of which astronomers have been enabled to reduce to perfect order the:seeming tangle of planetary evolutions. Th.? law really amounts, in effect, to. tijls: All objects suspended within he:Ta?v cancy of space attract or pull one another. an-other. How they can- do this without a visible connecting link betwesti them, is a mystery that, may always remain unsolved. But mystery .as ,.it is,, we must accept it as ascertained fact It is this pull of gravrtatien that holds together the sun and the planets, forcing forc-ing them all to follow out their pjoper paths. Why should:, not' this 'same |