11. It is very possible that some scattered readings cannot be reduced to any of the above-named classes, but enough has been said to afford the student a general notion of the nature and extent of the subject(13). It may be reasonably thought that a portion of these variations, and those among the most considerable, had their origin in a cause which must have operated at least as much in ancient as in modern times, the changes gradually introduced after publication by the authors themselves into the various copies yet within their reach. Such revised copies would circulate independently of those issued previously, and now beyond the writer’s control; and thus becoming the parents of a new family of copies, would originate and keep up diversities from the first edition, without any fault on the part of transcribers(14). It is thus perhaps we may best account for the omission or insertion of whole paragraphs or verses in manuscripts of a certain class [see above (1), (2), (3)]; or, in cases where the work was in much request, for those minute touches and trifling improvements in words, in construction, in tone, or in the mere colouring of the style [(5), (11), (12)], which few authors can help attempting, when engaged on revising their favourite compositions. Even in the Old Testament, the song of David in 2 Sam. xxii is evidently an early draft of the more finished composition, Ps. xviii. Traces of the writer’s _curae secundae_ may possibly be found in John v. 3, 4; vii. 53-viii. 11; xiii. 26; Acts xx. 4, 15; xxiv. 6-8. To this list some critics feel disposed to add portions of Luke xxi-xxiv.