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THE LIBRARY, THE SCHOOL, AND THE OBSERVATORY.
AUTHOR OF THE SUN,' 'OTHER WORLDS THAN OURS,' 'SATURN AND ITS SYSTEM,'
6 THE HANDBOOK OF THE STARS, ETC.
"Why did not somebody teach me the Constellations, and make
LONG MANS, GREEN, AND CO.
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This Atlas is reduced from my large Star Atlas. The plan on which it has been constructed—briefly described in the accompanying letterpress-needs no special discussion here; because I have already fully dealt with it in the introduction to the large Atlas. I may remark, however, that the present work affords new and striking evidence of the advantages of the plan; for we have here a little book which can be carried in the pocket, while the small Atlas published by the Society for Diffusing Useful Knowledge is printed on sheets about sixteen inches square; and yet the scale of the accompanying maps is larger than that of the S.D.U.K. Atlas. The reduction in size is gained chiefly by a reduction in the distortion of the maps, the maximum expansion due to this cause being fifty-eight times greater in the S.D.U.K. maps than in the present (see note at pp. 11, 12). Moreover, the twelve maps of this Atlas overlap, a fifth part of the heavens being included in the overlaps; so that each of the twelve maps exhibits a tenth part of the heavens.