Looking closely at the metric system, we must confess its simplicity and symmetry. Like every creation of science, it is according to rule. Master the rule and you master the system. On this account it may be acquired by the young with comparative facility, and, when once acquired, it may be used with despatch. Thus it becomes labor-saving and time-saving. Among its merits I cannot hesitate to mention the nomenclature. A superficial criticism has objected to the Greek and Latin prefixes; but this forgets that a system intended for universal adoption must discard all local or national terms. The prefixes employed are equally intelligible in all countries. They are no more French than English or German. They are common, or cosmopolitan, and in all countries they are equally suggestive in disclosing the denomination of the measure. They combine the peculiar advantages of a universal name and a definition. The name instantly suggests the measure with exquisite precision. If these words seem scholastic or pedantic, you must bear this for the sake of their universality and defining power. Unquestionably it is difficult for one generation to substitute a new system for that learned in childhood. Even in France the metric system was tardily adopted. Napoleon himself, on one occasion, said impatiently to an engineer who answered his inquiry in metres, “What are metres? Tell me in _toises_.” It was only in 1840 that the system was definitely required in the transaction of business. Since then it has been the legal system of France. Cloth is sold by the metre; roads are measured by the kilometre; meat is sold by the kilogram, or, as it is familiarly abridged, by so many _kilos_. It is generally admitted that the names are too long, although nobody has been able to suggest substitutes, unless we regard the various abridgments in that light. But no abridgment should be allowed to sacrifice the cosmopolitan character which belongs to the system. Thus, in England a nomenclature is proposed which would secure short names; but these would be different in each language, and entirely different from the French names. This is a mistake. The names in all languages should be identical, or so nearly alike as to be recognized at once. This may be accomplished by an abbreviated nomenclature.