It is said, also, that Numa built the temple of Vesta, which was intended for a repository of the holy fire, of a circular form, not to represent the figure of the earth, as if that were the same as Vesta, but that of the general universe, in the center of which the Pythagoreans place the element of fire, and give it the name of Vesta and the unit; and do not hold that the earth is immovable, or that it is situated in the center of the globe, but that it keeps a circular motion about the seat of fire, and is not in the number of the primary elements; in this agreeing with the opinion of Plato, who, they say, in his later life, conceived that the earth held a lateral position, and that the central and sovereign space was reserved for some nobler body. There was yet a farther use of the priests, and that was to give people directions in the national usages at funeral rites. Numa taught them to regard these offices, not as a pollution, but as a duty paid to the gods below, into whose hands the better part of us is transmitted; especially they were to worship the goddess Libitina, who presided over all the ceremonies performed at burials; whether they meant hereby Proserpina, or, as the most learned of the Romans conceive, Venus, not inaptly attributing the beginning and end of man's life to the agency of one and the same deity. Numa also prescribed rules for regulating the days of mourning, according to certain times and ages. As, for example, a child of three years was not to be mourned for at all; one older, up to ten years, for as many months as it was years old; and the longest time of mourning for any person whatsoever was not to exceed the term of ten months; which was the time appointed for women that lost their husbands to continue in widowhood. If any married again before that time, by the laws of Numa she was to sacrifice a cow big with calf.