CHAPTER VIII

PLANETS AND SATELLITES--(_continued_)

Analogy between Mars and the Earth--Martian Snowcaps, Seas, and Continents--Climate and Atmosphere--Schiaparelli's Canals--Discovery of Two Martian Satellites--Photographic Detection of Minor Planets--Orbit of Eros--Distribution of the Minor Planets--Their Collective Mass and Estimated Diameters--Condition of Jupiter--His Spectrum--Transits of his Satellites--Discovery of a Fifth Satellite--The Great Red Spot--Constitution of Saturn's Rings--Period of Rotation of the Planet--Variability of Japetus--Equatorial Markings on Uranus--His Spectrum--Rotation of Neptune--Trans-Neptunian Planets 274