kinds and in all sources, even those that are singular to a single document of infinitesimal weight as a witness, and even those that affect such very minor matters as the spelling of a word. Dr. Ezra Abbot was accustomed to say that about nineteen-twentieths of them have so little support that, although they are various readings, no one would think of them as rival readings; and nineteen-twentieths of the remainder are of so little importance that their adoption or rejection would cause no appreciable