[Our chronological arrangement must yield in minute accuracy to other considerations; and we may borrow an excuse from our author, who notes the difficulty of microscopic ἀκριβεία in his own chronological labours (book iii. cap. 29). It was impossible to crowd Tatian and Theophilus into vol. i. Of this serious, without dividing Irenæus, and putting part of his works in vol. ii. But, in the case of contemporaries, this dislocation is trifling, and creates no confusion.]