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of W. Herschel. In his great sweeps of the
heavens with his giant telescopes he opened
in this direction a new branch of astronomy.
˜
At one time he held that all nebulA might
be clusters of innumerable minute stars at a
great distance. Then he recognised the dif-
˜
ferent classes of nebulA, and became con-
vinced that there is a widely-diffused ”shin-
ing fluid” in space, though many so-called
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