It is by reason of wars that navies exist, and a few words as to our—now happily ended—conflict with Spain, may fitly close this review of naval progress. The military lessons of that struggle have been fully set forth by able writers. More important, by far, than these is its teaching as regard to our state and future as a nation. The world has learned that the people of these United States are stirred still by the same stern and dauntless spirit which, in Revolution and Civil War, has made and kept us a nation. Furthermore, with one swift stroke, the bounds which in theory and in territory circumscribed us have been swept away, and the United States have passed from a continental to a world power. This is not chance. It is but the leading onward to a destiny whose splendor we may not measure now, whose light and peace and prosperity shall traverse a hemisphere. The one note of sadness in it all is the memory of the gallant dead, of the heroes who fell that this might be. To them, in Cuba and the Philippines, Columbia—with a smile of pride and a sob of pain—drinks in the wine of tears to-day, as the smoke of battle fades. ASTRONOMY DURING THE CENTURY BY SELDEN J. COFFIN, A.M., _Professor of Astronomy, Lafayette College, Easton, Pa._ ITS PROGRESS, ACHIEVEMENTS, AND NOTABLE RESULTS 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. I. ASTRONOMY A CENTURY AGO.