COULOMB:—In honor of C. A. de Coulomb, of France. It is the practical unit of quantity in measuring electricity, and is the amount conveyed by one ampere in one second. FARAD:—From FARADAY, the physicist. It is the unit of electric capacity, and is the capacity of a condenser that retains one coulomb of charge with one volt difference of potential. GAUSS:—From Carl F. Gauss (1785–1855). The C. G. S. unit of flux-density, or the unit by which the intensity of magnetic fields are measured. It equals one weber per normal square centimetre. GILBERT:—The unit for measuring magneto-motive force, being produced by .7958 ampere-turn approximately. HENRY:—From Joseph Henry, of the Smithsonian Institution, Washington, D. C. The practical unit for measuring the induction in a circuit when the electro-motive force induced is one international volt, while the inducing current varies at the rate of one ampere per second. JOULE:—The C. G. S. unit of practical energy, being equivalent to the work done in keeping up for one second a current of one ampere against a resistance of one ohm. Named from J. P. Joule, of England. OERSTED:—From Oersted, the electrician. It is the practical unit for measuring electrical reluctance. WATT:—The practical electrical unit of the rate of working in a circuit, when the electro-motive force is one volt, and the intensity of current is one ampere. It is equal to 107 ergs per second, or .00134 horse-power per second. Named from James Watt, of Scotland. WEBER:—The practical unit for measuring magnetic flux. Named from W. Weber, of Germany. THE CENTURY’S NAVAL PROGRESS BY REAR ADMIRAL GEORGE WALLACE MELVILLE, U. S. N. I. INFLUENCE OF SEA POWER. The share of navies in the great movements which have moulded human destiny and shaped the world’s progress, although long obscure and undervalued, has met in our time full recognition. Within a decade the influence of sea power upon history has become the frequent theme of historians and essayists who, in clear and striking form, have shown the cardinal importance, both in war and commerce, of the fleet—the nation’s right arm on the sea. It is fitting, therefore, that in the retrospect of a hundred years navies should have their place; that, in looking backward with history’s unclouded vision, we should mark, not only their growth and change, but, as well, their achievement in some of the most memorable conflicts of our race.