LIST OF FULL-PAGE ILLUSTRATIONSFACING PAGE[A Total Solar Eclipse][Frontispiece][The Harvard College Observatory, Cambridge, Mass.][24][Isaac Newton][46][Galileo Galilei][52][The Lick Observatory, Mount Hamilton, Cal.][60][The Yerkes Observatory, Williams Bay, Wis.][100][The Moon, one day after First Quarter][150][William Herschel][234][Pierre Simon Laplace][364]