magnified

  98 40.   Another Portion of the Lunar Surface   99 41.   Lunar Landscape showing Earth   100 42.   Galileo's Method of estimating the Height of Lunar Mountain   101 43.   Some Clusters and Nebulæ   102 44.   Stages of the Discovery of Jupiter's Satellites   103 45.   Eclipses of Jupiter's Satellites   105 46.   Old Drawings of Saturn by Different Observers, with the imperfect Instruments of that day   111 47.   Phases of Venus   112 48.   Sunspots as seen with Low Power   113 49.   A Portion of the Sun's Disk as seen in a powerful modern Telescope   114 50.   Saturn and his Rings   115 51.   Map of Italy   118 52.   Portrait of Galileo   126 53.   Portrait of Descartes   148 54.   Descartes's Eye Diagram   151 55.   Descartes's Diagram of Vortices from his "Principia"   152 56.   Manor-house of Woolsthorpe   162 57.   Projectile Diagram   170 58. }   { 171 59. Diagrams illustrative of those near the Beginning of Newton's "Principia" 174 60.   175 61-2.   175 63.   Prismatic Dispersion   182