The second and third Empires, represented by the Bear and Leopard, are again represented by the Ram and He-Goat; but with this difference, that the Ram represents the kingdoms of the Medes and Persians from the beginning of the four Empires, and the Goat represents the kingdom of the Greeks to the end of them. By this means, under the type of the Ram and He-Goat, the times of all the four Empires are again described: I lifted up mine eyes, saith Daniel, and saw, and behold there stood before the river [Ulai] a Ram which had two horns, and the two horns were high, but one was higher than the other, and the higher came up last.

Vol. I, Ch. 9: Of the Kingdoms Represented in Daniel by the Ram and He-Goat - Observations upon the Prophecies of Daniel, and the Apocalypse of St. John (1733)