any other Western theologian, the developed and clearly expressed thought of Three coequal Persons was strange. Since, then, the word and the thought were rarely present in his mind, we cannot accept as the title of his work what is, after all, only a mediæval description. The composite character of the treatise, which must still for convenience be called the De Trinitate, is manifest. The beginnings of several of its books, which contain far more preliminary, and often rhetorical, matter than is necessary to link them on to their prede- cessors, point to a separate publication of each; a course which was, indeed, necessary under the literary conditions of the time. This piecemeal publication is further proved by the elaborate summaries of the contents of previous books which are given as, e.g., at the begin- ning of Trin. x.; and by the frequent repetition of earlier arguments at a later stage, which shews that the writer could not trust to the reader’s possession of the whole. Though no such attention has been devoted to the growth of this work as Noeldechen has paid to that of the treatises of Tertullian, yet some account of the process can be given. For although Hilary himself, in arranging the complete treatise, has done much to make it run smoothly and consecutively, and though the scribes who have copied it have probably made it appear still more homogeneous, yet some clues to its construction are left. The first is his description of the first book as the second (v. 3). This implies that the fourth is the first; and when we examine the fourth we find that, if we leave out of consideration a little preliminary matter, it is the beginning of a refutation of Arianism. It states the Arian case, explains the necessity of the term homoousios, gives a list of the texts on which the Arians relied, and sets out at length one of their statements of doctrine, the Epistle of Arius to Alexander, which it proceeds to demolish, in the remainder of the fourth book and in the fifth, by arguments from partic- ular passages and from the general sense of the Old Testament. In the sixth book, for the reason already given, the Arian Creed is repeated, after a vivid account of the evils of the time, and the refutation continued by arguments from the New Testament. In § 2 of this book there is further evidence of the composite character of the treatise. Hilary says that though in the first book he has already set out the Arian manifesto, yet he thinks good, as he is still dealing with it, to repeat it in this sixth. Hilary seems to have overlooked the dis- crepancy, which some officious scribe has half corrected76. The seventh book, he says at the beginning, is the climax of the whole work. If we take the De Trinitate as a whole, this is a meaningless flourish; but if we look on to the eighth book, and find an elaborate introduction followed by a line of argument different from that of the four preceding books, we must be inclined to think that the seventh is the climax and termination of what has been an inde- pendent work, consisting of four books. And if we turn to the end of the seventh, and note that it alone of all the twelve has nothing that can be called a peroration, but ends in an ab- 76 Similarly in iv. 2 he alludes to the first book, meaning that which we call first, though, as we saw, in v. 3 he speaks of our fifth as his second. 46 The Life and Writings of St. Hilary of Poitiers.