Produced by Robert J. Hall. [Page ii] [Illustration: THE CONSTELLATIONS OF ORION AND TAURUS. NOTES.--Star a in Taurus is red, has eight metals; moves east (page 227). At o above tip of right horn is the Crab Nebula (page 219). In Orion, a is variable, has five metals; recedes 22 miles per second. b, d, e, x, r, etc., are double stars, the component parts of various colors and magnitudes (page 212, note). l and i are triple; s, octuple; th, multiple, surrounded by a fine Nebula (page 218).] [Page iii] RECREATIONS IN ASTRONOMY WITH _DIRECTIONS FOR PRACTICAL EXPERIMENTS AND TELESCOPIC WORK_ BY HENRY WHITE WARREN, D.D. AUTHOR OF "SIGHTS AND INSIGHTS; OR, KNOWLEDGE BY TRAVEL," ETC. WITH EIGHTY-THREE ILLUSTRATIONS AND MAPS OF STARS [Page v] [Greek: TAEI PSUCHAEI TAEI AGAPAETAEI ASTRAPOUSAEI KAI ISAGGEDOI] [Page vii] PREFACE. All sciences are making an advance, but Astronomy is moving at the double-quick. Since the principles of this science were settled by Copernicus, four hundred years ago, it has never had to beat a retreat. It is rewritten not to correct material errors, but to incorporate new discoveries. Once Astronomy treated mostly of tides, seasons, and telescopic aspects of the planets; now these are only primary matters. Once it considered stars as mere fixed points of light; now it studies them as suns, determines their age, size, color, movements, chemical constitution, and the revolution of their planets. Once it considered space as empty; now it knows that every cubic inch of it quivers with greater intensity of force than that which is visible in Niagara. Every inch of surface that can be conceived of between suns is more wave-tossed than the ocean in a storm. The invention of the telescope constituted one era in Astronomy; its perfection in our day, another; and the discoveries of the spectroscope a third--no less important than either of the others. While nearly all men are prevented from practical experimentation in these high realms of knowledge, few [Page viii] have so little leisure as to be debarred from intelligently enjoying the results of the investigations of others. This book has been written not only to reveal some of the highest achievements of the human mind, but also to let the heavens declare the glory of the Divine Mind. In the author's judgment, there is no gulf that separates science and religion, nor any conflict where they stand together. And it is fervently hoped that anyone who comes to a better knowledge of God's works through reading this book, may thereby come to a more intimate knowledge of the Worker.