HEMERODROMI were also a sort of couriers among the ancients, who only travelled one day, and then delivered their packets or dispatches to a fresh man, who run his day, and so on to the end of his journey. The Greeks had couriers of this kind, which they derived from the Persians, who were the inventors thereof, as appears from Herodotus. Augustus had the same; at least he established couriers, who, if they did not relieve each other from day to day, yet did it from space to space, and that space was not very great.