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The discovery of argon did not destroy our conclusions regarding the nature and characteristics of oxygen or hydrogen or nitrogen, nor give an entirely new meaning to the word “atmosphere.” If even so many as seven new planets should be discovered, there would yet not be a single paragraph of this book which would need revising.

Astronomers employ an imaginary circular orbit for the planets, in which they move at an uniform rate of velocity, which is called the mean motion.Neptune revolves around the Sun in its distant orbit once in about 165 years.Uranus completes its orbital revolution in 84 years, Jupiter in 12 years, Mars in about 15 months, Venus in 11 months, and Mercury in 18 weeks.At certain points in their orbits they will appear to remain stationary in the same part of the Zodiac.The annexed illustration will assist the lay reader perhaps.