The order in which the foundation stones of the New Jerusalem are given in the book of Revelation determined the succession 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.[427] 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 commentaries their learned men have written upon this subject, and the fact that the well-to-do among the chosen people have always carried with them in their wanderings many precious stones, all this seems to make it likely that to the Jews should be attributed the fashion of wearing natal stones. However, whether this conjecture be correct or erroneous, the fashion once started became soon quite general and has as many votaries to-day as ever before. There can be no doubt that the owner of a ring or ornament set with a natal stone is impressed with the idea of possessing something more intimately associated with his or her personality than any other stone, however beautiful or costly it may be. If it be objected that this is nothing but imagination due to sentiment, we must bear in mind that imagination is one of the most potent factors in our life; indeed, the great Napoleon is quoted as saying that it ruled the world. Probably the very earliest text we have in which the stones of the breastplate are positively associated with the months of the year is to be found in the “Antiquities of the Jews,” by Flavius Josephus.[428] This runs as follows: