The sanitarian seeks to aid in the amenities and relaxations of life as well. The playgrounds for children, the athletic grounds by the riverside at Boston, recreation piers in New York, are examples of this. And all of these are comparatively recent efforts, adding to the catalogue of achievements during the century. It was the arch-enemy who, in the poem of antiquity, said: “All that a man hath will he give for his life.” But he made the remark after much observation, and to Jehovah, unto whom even he would not dare to lie; and the rolling years since the Hebrew epic was first written have only added testimony to the truth of the assertion. In these later days, when the rule and plummet are everywhere applied, where the scientist delves and classifies to seek the cosmos in the apparent chaos, there was evolved out of self-seeking for life a higher and better quest,—a search for those things which make for the health of all. This search has widened, until many a broad savannah has been trodden, many a mountain scaled and wilderness explored. With its ever extending view, new responsibilities and greater cares have been thrust upon those who are endeavoring to rule in this domain. A community, a nation, is but a unit. Let one part suffer, and all are in pain; let one but decay, and rot is imminent everywhere. There can be no true social progress, no real stability of government, no national prosperity worthy the name, unless the environment of each individual permits the enjoyment of personal health, if he individually observes but the ordinary care of self. And whatever else of progress for sanitary science may be granted or denied as belonging to our century, the crowning claim of all, which cannot be taken from her, is that, along with the ideas embodied in commonweal and commonwealth, she has added the other of equal dignity and worth—Public Health. THE CENTURY’S ARMIES AND ARMS BY LIEUTENANT-COLONEL ARTHUR L. WAGNER, _Assistant Adjutant General, U. S. Army_. A true appreciation of the progress made in the arts and sciences in the nineteenth century can be obtained only by contrasting the conditions found at present with those existing a hundred years ago. The difference between the sperm candle and the electric light; between the stage-coach and the rapid-flying express train; between the flail and the threshing machine; between the hand-loom and the machinery of the modern woollen mill; between the cruel medical operations of five score years ago and the skillful surgery, with the use of anæsthetics, of the present day; or between the mail-carrier with letters in his saddle-bags and the electric telegraph flashing news instantaneously from continent to continent; marks the difference between the beginning of the nineteenth and the opening of the twentieth centuries.