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Astronomy, the oldest of all the family of sciences, is not a whit behind its sister branches in activity of research and brilliance of discovery. The assiduity and zeal of its devotees are marvelous. The celestial field is so wide, the depths of space between the stars so vast, that no assurance can ever be given to an astronomer that a lifetime of faithful and intelligent research will be rewarded with even a single discovery of importance. In this respect it differs materially from other branches of science.

Nevertheless the patient labor of those who serve in its temple has rarely failed to receive an adequate reward. The discovery made in August, 1877, by Professor Asaph Hall, of Washington, that the planet Mars is attended by two satellites, is a convincing illustration of this peculiarity of the pursuit of astronomy as a study. An indefatigable watcher of the skies for many years, Professor Hall, looking at this planet at its opposition in 1877, when it was unusually near to the earth, was surprised to note two tiny points of light quite close to it; seeing them again the next evening, changed in their positions relative to Mars, it flashed upon him that the firm tradition that Mars had no moons was now disproved. His name will be forever associated with these two bodies, Deimos and Phobos, as their discoverer, although they are but wee orbs, only seven miles in diameter.