larum_, 167.
_Palus Putredinis_, 167.
_Palus Somnii_, 159.
_Sinus AEstuum_, 172.
_Sinus Iridum_, 172, 173.
Other formations:
Alps Mountains, 163.
Apennine Mountains, 163, 167, 175.
Cape Agarum, 158.
Cape Heraclides, 173.
Cape Laplace, 173.
Carpathian Mountains, 176.
Caucasus Mountains, 163.
Cordilleras Mountains, 180.
D'Alembert Mountains, 180.
Doerfel Mountains, 180.
Haemus Mountains, 165.
Harbinger Mountains, 174.
Leibnitz Mountains, 180.
"Lunar Railroad," 176.
Mt. Argaeus, 165, 167.
Mt. Hadley, 167.
Mt. Huygens, 175.
Pyrenees Mountains, 169.
Taurus Mountains, 164.

THE PLANETS: Are there planets among the stars? 183.
Mars, two views of, 17.
best advertised of planets, 151.
favorable oppositions of, 152.
seen with 5-inch telescope, 152.
polar caps of, 152.
color of, 152.
dark markings on, 152.
"canals," 153.
earthlike condition of, 153.
Mercury, phases of, 155.
peculiar rotation of, 155.
markings on, 155.
probably not habitable, 155.
Jupiter, easiest planet for amateurs, 141.
seen with 5-inch glass, 141.
satellites, swift motions of, 142.
velocity of planet's equator, 142.
how to see all sides of, 142, 143.
watching rotation of, 143.
eclipses and transits of satellites, 144, 147.
belts and clouds of, 145.
different rates of rotation, 145.
names and numbers of satellites, 146.
Saturn, next to Jupiter in attractiveness, 147.
seen with 5-inch glass, 148.
its moons and their orbits, 148, 149.
polar view of system, 149.
Roche's limit, 149, 150.
origin of the rings, 150.
Pickering's ninth satellite, 151.
the satellites as telescopic objects, 151.
Venus, her wonderful brilliance, 153.
her atmosphere seen, 153.
Lowell's observations, 153.
Schiaparelli's observations, 154.
her peculiar rotation, 154.
how to see, in daytime, 155.
Neptune and Uranus, 155.

THE SUN, 181.
shade glasses for telescopes in viewing, 181.
solar prism, 181.
helioscope, 181.
periodicity of spots, 181.
to see, by projection, 182.
spectroscope for solar observation, 182.

THE TELESCOPE:
refractors and reflectors, 2, 8.
eyepieces, 6, 9, 10.
aberration (chromatic), 6;
(spherical), 6, 17.
achromatic telescopes, how made, 7.
object glass, 8.
magnif