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Introduction 7

CHAPTER I.

Statement of the Problem of Solar Energy 17

CHAPTER II.

The Constitution and Phenomena of the Sun 39

CHAPTER III.

The Mode of Solar Energy 70

CHAPTER IV.

The Source of Solar Energy 96

CHAPTER V.

The Distribution and Conservation of Solar Energy 139

CHAPTER VI.

The Phenomena of the Stars 162

CHAPTER VII.

Temporary Stars, Meteors, and Comets 187

CHAPTER VIII.

The Phenomena of Comets 210

CHAPTER IX.

Interpretation of Cometic Phenomena 225

CHAPTER X.

The Resolvable NebulÆ, Star-Clusters and Galaxies 237

CHAPTER XI.

The Gaseous NebulÆ 253

CHAPTER XII.

The Nebular Hypothesis: its Basis and its Difficulties 268

CHAPTER XIII.

The Genesis of Solar Systems and Galaxies 282

CHAPTER XIV.

The Mosaic Cosmogony 308

CHAPTER XV.

Conclusion. The Harmony of Nature’s Laws and Operations 341

Reference Index of Authorities Cited 349

Classified Index of Subject-Matter 353