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308 THE CURIOUS LORE OP PRECIOUS STONES
mined the succssion of natal stones for the months. The first stone was assigned to St. Peter and to the month of March, to the leader of the apostles and to the month of the spring equinox ; the second to the month of April ; the third to May, etc. When, however, many centuries later,—probably in Poland, as we have stated,—with the aid of the rabbis or the Hebrew gem traders, the wearing of natal stones became usual, certain changes had been made in this order and some stones not mentioned among those of the breastplate, or of the New Jerusalem, were substituted for certain of these,—notably the turquoise for the month of December, the ruby for July, and the diamond for April. In modern times the turquoise has become the stone for July while the ruby has been as­signed to December.
There is some evidence in favor of the theory that at the outset all twelve stones were acquired by the same person and worn in turn, each one during the respective month to which it was assigned, or during the ascendancy of its zodiacal sign. The stone of the month was be­lieved to exercise its therapeutic or talismanic virtue to the fullest extent at that period. Perhaps the fact that this entailed a monthly change of ornaments may rather have been a recommendation of the usage than the reverse.1
It seems highly probable that the development of the belief in natal stones that took place in Poland was due to the influence of the Jews who settled in that country shortly before we have historic notice of the use/of the twelve stones for those born in the respective months. The lively interest always felt by the Jews regarding the gems of the breastplate, the many and various commen-
1 Bruckmann, "Abhandlung von Edelsteinen," 2d ed., Braunsch­weig, 1773, p. 358.