CHAPTER XII. 214

STELLAR DISTRIBUTION AND THE STRUCTURE OF THE UNIVERSE. Work of John Herschel—Researches of Wilhelm Struve—Extinction of light—Mädler’s “central sun”—Distribution of nebulæ—Work of Proctor—Aggregation of stars on the Galaxy—Work of Gore and Schiaparelli—Studies of Gould—Researches of Kapteyn—Of Newcomb—Is the Universe limited? Newcomb’s argument—Observations of Celoria—Researches of Seeliger—External Universes—Gore’s speculations