Abstract
IT is now generally believed that many of the dark markings in the Milky Way, and dark starless regions in the sky, are produced by the interposition of huge obscuring clouds between us and the more remote stars. A long list of such dark markings has been given by Barnard,2 who has done more than anyone else to point out their importance and probable nature. In some cases, as in the Pleiades, Orion, and Ophiuchus, these “regions of obscuration” merge into faintly luminous nebulosity in the vicinity of certain stars, in such a way that there can be no doubt that they lie near these stars in space.
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