lines from the circumference of which meeting in a center, by holding it in the light of the sun they can collect and concentrate all its rays at this one point of convergence; where the air will now become rarefied, and any light, dry, combustible matter will kindle as soon as applied, under the effect of the rays, which here acquire the substance and active force of fire. Some are of opinion that these vestals had no other business than the preservation of this fire; but others conceive that they were keepers of other divine secrets, concealed from all but themselves, of which we have told all that may lawfully be asked or told, in the life of Camillus. Gegania and Verenia, it is recorded, were the names of the first two virgins consecrated and ordained by Numa; Canuleia and Tarpeia succeeded; Servius afterwards added two, and the number of four has continued to the present time. The statutes prescribed by Numa for the vestals were these: that they should take a vow of virginity for the space of thirty years, the first ten of which they were to spend in learning their duties, the second ten in performing them, and the remaining ten in teaching and instructing others. Thus the whole term being completed, it was lawful for them to marry, and, leaving the sacred order, to choose any condition of life that pleased them; but this permission few, as they say, made use of; and in cases where they did so, it was observed that their change was not a happy one, but accompanied ever after with regret and melancholy; so that the greater number, from religious fears and scruples, forbore, and continued to old age and death in the strict observance of a single life.