"A star is drawing on some vast reservoir of energy," says Eddington, "by means unknown to us. This reservoir can scarcely be other than the sub-atomic energy which, it is known, exists abundantly in all matter; we sometimes dream that man will one day learn how to release it and use it for his service. The store is well-nigh inexhaustible, if only it could be tapped. There is sufficient in the sun to maintain its output of heat for fifteen billion years." * * * * * Transcriber's Notes: Obvious punctuation errors repaired. Hyphenation and spelling was standardized by using the most prevalent form. The oe ligature was converted to the letters "oe". Whole and fractional parts of numbers are displayed as follows: 365-1/4. Page Correction ==== =================== 20 Aa => Aya 39 Ulugh Begh => Ulugh Beg 46 Instaurata Mecanica => Instauratæ Mechanica 58 Oscillatorium Horologium => Horologium Oscillatorium 225 seceded => succeeded 226 areoplane => aeroplane 320 Plate 2 - Vulpeculæ => Vulpecula Text Emphasis _Text_ - Italic =Text= - Bold