A copy of Porter's script for 'The Night Sky in October' on autumn bringing the Pleiades, Orion, Taurus and Aldebaran; the Moon not occulting the Pleiades and two full Moons in October; Mercury visible in the morning with Jupiter and Mars; Venus becoming an evening star; the meaning of 'inferior planet' as a term applied to Venus and Mercury, and of 'superior planet' as applied to those that reach opposition and have a retrograde motion; our knowledge of Mercury and the difficulty in observing this planet; past theories of a planet inferior to Mercury; Le Verrier and the planet Vulcan, postulated to explain the precession of the orbit of Mercury, since explained by the General Theory of Relativity; Vulcan 'discovered' by Lescarbault, 26 March 1859; the observation of two small 'planets' near the Sun during an eclipse of 1878; other spots crossing the Sun's face; asteroids' paths inside the orbit of Mercury, such as Amor, Apollo and Icarus; and calculations of the planetary ephemeris up to 1980.