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THE MOON AND PLANETS, METEORS AND COMETS, THE
SUN AND COLOURED PAIRS OF SUNS.
Author of The Sun,' Other Worlds than Ours,' 'Saturn and its System,
'A New Star Atlas,' dc.
'Not to this evanescent speck of earth
LONG MANS, GREEN, AND CO.
All rights reserved.
PREFACE TO THE FIRST EDITION.
THIS VOLUME contains matter which, if space had permitted, I should have included in Other Worlds than Ours,' partly in the way of introduction or explanation, and partly to complete the information contained in the several chapters. It will be understood that to make this work complete in itself, I have admitted certain passages which contain information already given in • Other Worlds than Ours;' but such passages amount in all but to some ten or twelve pages : the rest of the work is strictly supplementary to that volume.
The paper on the Gamut of Light' presents the subject of spectroscopic analysis in a way which I have found effective with those readers who are not desirous of discussing the details of this mode of research. In the next two papers on Other Habitable Worlds' and Other Inhabited Worlds,' a sketch is given on the