here the wheat-grain being used to form the smallest unit as it is in the modern Arabic system. The double obol of the Assyrians weighs 30 grains; we shall also find that the Hebrew gêrâh or obol (twenty of which made a shekel), weighed exactly 15 grains of wheat, that is the Hebrew gêrâh is the light obol which stood side by side with the heavy obol of 30 grains in the Assyrian system. Let us treat the matter from a slightly different point of view: As the light Assyrian obol contained 15 Assyrian grains, the light shekel contained 180 Assyrian grs. But as we know that this light Assyrian shekel weighed 8·4 grams, or 131 grains Troy, and as we know that the Troy grain is really the barley-corn and likewise that 3 barley-corns = 4 wheat grains, it is obvious that 131 grains Troy = 175 wheat grs. nearly, a very close approximation to the 180 Assyrian grs. Again as 180 Assyrian grs. = 8·4 grams, the Assyrian grain weighed ·046 gram, that is almost exactly the weight of a wheat grain (·047 gram).
But let us see for a moment in what fashion M. Aurès accounts for the presence of corn-grains in a system so elaborately scientific as he and his school maintain.
Starting as usual with the old assumption that all weight standards come from the measures of capacity and all measures of capacity in their turn are derived from the linear measures, he proceeds thus: The Assyrian ideogram which represents tribute, likewise represents talent. Tribute being paid in corn, no doubt the idea of weight first arose as the people carried their quota of corn on their backs to the receipt of custom. They accordingly weighed the measure (bar), which contained the proper amount of corn and took it as their weight unit, and then proceeded to make subdivisions of it. When their weight system was thus fixed, for convenience instead of going to the trouble of adjusting weights they took 30 grains of corn which would be just equivalent to the weight of an obol. After the many historical instances quoted in the preceding pages in which the methods of appraising the value of corn and other dry commodities have been set out, and also the manner in which corn grains have been employed for