That these beliefs were not separated from their astronomical ideas is seen from the fact that they peopled the firmament with the departed. The Milky Way was called the town of Gwyon (Coer or Ker Gwydion, Ker in Breton, Caer in Gaulish, Kohair in Gaelic); certain bardic legends gave to Gwyon as father a genius called Don, who resides in the constellation of Cassiopeia, and who figures as "the king of the fairies" in the popular myths of Ireland. The empyrean is thus divided between various heavenly spirits. Arthur had for residence the Great Bear, called by the Druids "Arthur's Chariot." We are not, however, entirely limited to tradition and the reports of former travellers for our information as to the astronomy of the Druids, but we have also at our service numerous coins belonging to the old Gauls, who were of one family with those who cultivated Druidism in our island, which have been discovered buried in the soil of France. The importance which was given to astronomy in that race becomes immediately evident upon the discovery of the fact that these coins are marked with figures having reference to the heavenly bodies, in other words are astronomical coins. If we examine, from a general point of view, a large collection of Gaulish medals such as that preserved in the National Museum of Paris, we observe that among the essential symbols that occupy the fields are types of the Horse, the Bull, the Boar, the Eagle, the Lion, the Horseman, and the Bear. We remark next a great number of signs, most often astronomical, ordinarily accessory, but occasionally the chief, such as the sign [symbol: rotated mirrored S], globules surrounded by concentric circles, stars of five, six, or eight points, radiated and flaming bodies, crescents, triangles, wheels with four spokes, the sign [symbol: infinity], the lunar crescent, the zigzag, &c. Lastly, we remark other accessory types represented by images of real objects or imaginary figures, such as the Lyre, the Diota, the Serpent, the Hatchet, the Human Eye, the Sword, the Bough, the Lamp, the Jewel, the Bird, the Arrow, the Ear of Corn, the Fishes, &c. On a great number of medals, on the stateres of Vercingetorix, on the reverses of the coins of several epochs, we recognize principally the sign of the Waterer, which appears to symbolize for one part of antiquity the knowledge of the heavenly sphere. On the Gaulish types this sign (an amphora with two handles) bears the name of Diota, and represents amongst the Druids as amongst the Magi the sciences of astronomy and astrology. Some of these coins are represented in the woodcut below. [Illustration: FIG. 2.] The first of these represents the course of the Sun-Horse reaching the Tropic of Cancer (summer solstice), and brought back to the Tropic of Capricorn (winter solstice).