'A POPULAR HISTORY OF ASTRONOMY DURING THE NINETEENTH CENTURY,' 'THE SYSTEM OF THE STARS,' 'PROBLEMS IN ASTROPHYSICS,' AND OTHER WORKS Of the sixteen chapters constituting this little work, thirteen have been published as a series, begun in _Knowledge_ and continued in _Knowledge and Illustrated Scientific News_, and to the proprietors of those journals, for their courteous permission to reprint them, I offer my sincere thanks. Three additional chapters, equivalent to, though not identical with, those that now appear, formed an integral part of the original plan of the book, now presented to the public in the hope that it will enable general readers to follow, with the profound interest i…
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