Nor can there be any serious doubt, if the Book be one coherent whole, written by one author, that by the fourth empire is meant, as in later chapters, that of Alexander and his successors--"_the Diadochi_," as they are often called. For it must be regarded as certain that the four elements of the colossus, which indicate the four empires as they are presented to the imagination of the heathen despot, are closely analogous to the same four empires which in the seventh chapter present themselves as wild beasts out of the sea to the imagination of the Hebrew seer. Since the fourth empire is there, beyond all question, that of Alexander and his successors, the symmetry and purpose of the Book prove conclusively that the fourth empire here is also the Græco-Macedonian, strongly and irresistibly founded by Alexander, but gradually sinking to utter weakness by its own divisions, in the persons of the kings who split his dominion into four parts. If this needed any confirmation, we find it in the eighth chapter, which is mainly concerned with Alexander the Great and Antiochus Epiphanes; and in the eleventh chapter, which enters with startling minuteness into the wars, diplomacy, and intermarriages of the Ptolemaic and Seleucid dynasties. In viii. 21 we are expressly told that the strong he-goat is "the King of Grecia," who puts an end to the kingdoms of Media and Persia. The arguments of Hengstenberg, Pusey, etc., that the Greek Empire was a civilising and an ameliorating power, apply at least as strongly to the Roman Empire. But when Alexander thundered his way across the dreamy East, he was looked upon as a sort of shattering levin-bolt. The interconnexion of these visions is clearly marked even here, for the juxtaposition of iron and miry clay is explained by the clause "they shall mingle themselves with the seed of men:[310] but they shall not cleave one to another, even as iron is not mixed with clay." This refers to the same attempts to consolidate the rival powers of the Kings of Egypt and Syria which are referred to in xi. 6, 7, and 17. It is a definite allusion which becomes meaningless in the hands of those interpreters who attempt to explain the iron empire to be that of the Romans. "That the _Greek_ Empire is to be the last of the Gentile empires appears from viii. 17, where the vision is said to refer to 'the time of the end.' Moreover, in the last vision of all (x.-xii.), the rise and progress of the Greek Empire are related with many details, _but nothing whatever_ is said of any subsequent empire. Thus to introduce the Roman Empire into the Book of Daniel is to set at naught the plainest rules of exegesis."[311]