(7) Another source of error is described by some critics as proceeding _ex ore dictantis_, in consequence of the scribe writing from dictation, without having a copy before him. One is not, however, very willing to believe that manuscripts of the better class were executed on so slovenly and careless a plan. It seems more simple to account for the _itacisms_(7) or confusion of certain vowels and diphthongs having nearly the same sound, which exist more or less in manuscripts of every age, by assuming that a vicious pronunciation gradually led to a loose mode of orthography adapted to it. Certain it is that itacisms are much more plentiful in the original subscriptions and marginal notes of the writers of mediaeval books, than in the text which they copied from older documents. Itacisms prevailed the most extensively from the eighth to the twelfth century, but not by any means during that period exclusively:—indeed, they are found frequently in the oldest existing manuscripts. In the most ancient manuscripts the principal changes are between ι and ει, αι and ε, though others occur: in later times η ι and ει, η οι and υ, even ο and ω, η and ε, are used almost promiscuously. Hence it arises that a very large portion of the various readings brought together by collators are of this description, and although in the vast majority of instances they serve but to illustrate the character of the manuscripts which exhibit them, or the fashion of the age in which they were written, they sometimes affect the grammatical form (e.g. ἔγειρε or ἔγειραι Mark iii. 3; Acts iii. 6; _passim_: ἴδετε or εἴδετε Phil. i. 30), or the construction (e.g. ἰάσωμαι or ἰάσομαι Matt. xiii. 15: οὐ μὴ τιμήσῃ or οὐ μὴ τιμήσει Matt. xv. 5: ἵνα καυθήσωμαι or ἵνα καυθήσομαι 1 Cor. xiii. 3, compare 1 Pet. iii. 1), or even the sense (e.g. ἑταίροις or ἑτέροις Matt. xi. 16: μετὰ διωγμῶν or, as in a few copies, μετὰ διωγμόν Mark x. 30: καυχᾶσθαι δὴ οὐ συμφέρει or καυχᾶσθαι δεῖ; οὐ συμφέρει 2 Cor. xii. 1: ὅτι χρηστὸς ὁ Κύριος or ὅτι χριστὸς ὁ Κύριος 1 Pet. ii. 3). To this cause we may refer the perpetual interchange of ἡμεῖς and ὑμεῖς, with their oblique cases, throughout the whole Greek Testament: e.g. in the single epistle of 1 Peter, ch. i. 3; 12; ii. 21 _bis_; iii. 18; 21; v. 10. Hence we must pay the less regard to the reading ἡμέτερον Luke xvi. 12, though found in two or three of our chief authorities: in Acts xvii. 28 τῶν καθ᾽ ἡμᾶς, the reading of the great Codex Vaticanus and a few late copies, is plainly absurd. On the other hand, a few cases occur wherein that which at first sight seems a mere _itacism_, when once understood, affords an excellent sense, e.g. καθαρίζων Mark iii. 19, and may be really the true form.