The work of transcription can never be altogether exempt from the corruptions of mere accident, arising from the wanderings of the eye and the slips of the pen. A place affected by various readings should, therefore, be carefully scanned for the detection of any probable mechanical cause of such mischief, anything likely to betray a copyist into unwitting mistakes. Of the endless shapes which these might take two kinds may be especially mentioned, the interchange of words slightly differing in form,
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