Imágenes de páginas
PDF
EPUB

viii

FROM PREFACE TO FIRST EDITION.

subject of the Plurality of Worlds. The fourth paper relates to the application of the Rosse Telescope to determine the heat of the lunar surface. Then follow papers on Venus, Mars, and Jupiter ; two essays on Meteors, one relating to the past history and the other to the present condition of meteoric researches ; a paper on Tyndall's Theory of Comets (a subject deserving close examination), and another on the general phenomena of comets and comets' tails. The three papers on the Solar Corona might have been added, almost as they stand, to my chapter on. What we learn from the Sun,' in Other Worlds, but for the requirements of space. Lastly there is a paper on the Colours of the Double Stars, a subject which the same cause compelled me to leave almost untouched in that work.

I have to return my thanks to the editors and publishers of the magazines from which these essays have been taken, for permission to reproduce them.

R. A. P.

PREFACE TO THE SECOND EDITION.

All the Essays in the volume have been carefully revised, and some drawings illustrating Solar Outbursts have been added. In other respects the volume remains almost unaltered.

R. A. P.

[blocks in formation]

LIST OF ILLUSTRATIONS.

A CHART OF MARS ON MERCATOR'S PROJECTION

Frontispiece

Fig. 1. SOLAR CLOUD PROMINENCE SEEN BY PROF.

YOUNG, SEPT. 7, 1871

page 304

[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small]
« AnteriorContinuar »