divided into 10 gerahs (Hebrew: **). The latter signifies "a grain" or "bean." The Hebrew literature does not state what kind of seed or grain it was, although it is defined by Rabbinical writers as equal to 16 barleycorns. But the fact is that, as we see from the Septuagint rendering, the name in the course of time came to be considered simply as that of one-twentieth of the shekel, whether that shekel was the shekel of the Sanctuary, the Phoenician silver shekel of 220 grains, or the kings shekel of 260 grains used for copper and lead. The gerah of the gold shekel or shekel of the Sanctuary was probably the most ancient and came closest to the natural seed from which it derived its name; this gerah would be about 6-1/2 grains (130 ÷ 20 = 6·5). On an earlier page (p. 194) we gave the weights of a number of grains and seeds of plants, and amongst them that of the lupin, called by the Greeks thermos. According to the ancient tables the thermos is equal to two keratia, or siliquae (the seeds of the carob tree); but since each siliqua = 4 wheat grains, the thermos = 8 wheat grains, or 6 barleycorns, or 6 Troy grains. If the wheat grain in Palestine was as heavy as that of Egypt or Africa (·051 gram, instead of ·047 gram.), the 8 wheat grains, would = 6·4 grains troy. Again, the Roman metrologists estimated the lupin as the third part of the scripulum, which weighed 24 grains of wheat[1]; thus the Roman lupin also = 8 wheat grains. We may therefore have little doubt that the gerah was simply the lupin[2]. But what about the Rabbinical gerah of 16 barleycorns? In the first place let us recall the confusion which exists in the Arab metrologists respecting the habba, some making three habbas, some four equal to the karat. This arose, as we saw, from confounding the wheat and barley grain. If the 16 grains assigned to the gerah by the Rabbis are really wheat grains, all is at once clear. The gerah to which they refer is that of the royal or double shekel (260 grs.), or in other words it is a double gerah. We have just found the gerah of the Sanctuary shekel to be the lupin, and equal to 8 wheat grains, accordingly its double will contain 16 wheat grains.
