Doubtless, strenuous efforts were made to remedy these defects, and, apparently as the result of those efforts, the Arabic or Indian mode appeared; which, signifying the powers of the base by position, reduced the number of signs to that of the arithmetical series, beginning with nought and ending with a number of the value of the base less one. The peculiarity of the Arabic mode, therefore, in comparison with the Greek, the Roman, or the alphabetic, is place value; the value of a combination by either of these being simply equal to the sum of its elements. By that, the value of the successive places, counting from right to left, being equal to the successive powers of the base, beginning with the noughth power, each figure in the combination is multiplied in value by the power of the base proper to its place, and the value of the whole is equal to the sum of those products. The Arabic mode is justly esteemed one of the happiest results of human intelligence; and though the most complex ever practised, its efficiency, as an arithmetical means, has obtained for it the reputation of great simplicity,--a reputation that extends even to the present base, which, from its intimate and habitual association with the mode, is taken to be a part of the mode itself. With regard to this impression it may be remarked, that the qualities proper to a mode bear no resemblance to those proper to a base. The qualities of the present mode are well known and well accepted. Those of the present base are accepted with the mode, but those proper to a base remain to be determined. In attempting to ascertain these, it will be necessary to consider the uses of numeration and of notation. These may be arranged in three divisions,--scientific, mechanical, and commercial. The first is limited, being confined to a few; the second is general, being common to many; the third is universal, being necessary to all. Commercial use, therefore, will govern the present inquiry. Commerce, being the exchange of property, requires real quantity to be determined, and this in such proportions as are most readily obtained and most frequently required. This can be done only by the adoption of a unit of quantity that is both real and constant, and such multiples and divisions of it as are consistent with the nature of things and the requirements of use: real, because property, being real, can be measured by real measures only; constant, because the determination of quantity requires a standard of comparison that is invariable; conveniently proportioned, because both time and labor are precious. These rules being acted on, the result will be a system of real, constant, and convenient weights, measures, and coins. Consequently, the numeration and notation best suited to commerce will be those which agree best with such a system.