Lecture Iii.

THE INNER PLANETS.

Mercury, Venus, and Mars--How to make a Drawing of our System-- The Planet Mercury--The Planet Venus--The Transit of Venus-- Venus as a World--The Planet Mars and his Movements--The Ellipse--The Discoveries made by Tycho and Kepler--The Discoveries made by Newton--The Geography of Mars--The Satellites of Mars--How the Telescope aids in Viewing Faint Objects--The Asteroids, or Small Planets 134