Amongst the most remarkable instances of the result of careful observation and systematized thought which Western Asia has given to the world at large, are the Signs of the Zodiac, and the ancient extra-zodiacal constellation-figures, northern and southern; and by ‘ancient’ I mean those which have been enshrined for all future time in the Phainomena of Aratos. Of the Twelve Signs I shall only speak incidentally. It is now many years since Ideler and Guigniaut, contrary to the views of Letronne, arrived at the correct conclusion that the Signs of the Zodiac came, with so much else of archaic thought and civilization, from, the Euphrates Valley; and, having firmly established themselves in Hellenic usage, were afterwards carried by Greek conquerors as far as India in the east and Egypt in the south. But, although modern research has supplied an immense amount of material for the purpose, it is remarkable that the classic work of Ideler still gives the best account of the constellation-figures and their various stars. Surely, then, it is time that an effort was made to utilize in a connected form some at least of the results of subsequent investigation; and, although the inquiry, like all such, is progressive, and, like all researches into the ancient and archaic past, is beset with numerous difficulties, yet the principles to be applied and the general outlines of the subject are clear and distinct.