altered by the proportion of the majority to the minority.
57. Except where some one particular corruption was so obvious and tempting that an unusual number of scribes might fall into it independently, a few documents are not, by reason of their mere paucity, appreciably less likely to be right than a multitude opposed to them. As soon as the numbers of a minority exceed what can be explained by accidental coincidence, so that their agreement in error, if it be error, can only be explained on genealogical grounds, we have thereby passed beyond purely numerical relations, and the necessity of examining the genealogy of both minority and majority has become apparent. A theoretical presumption indeed remains that a majority of extant documents is more likely to represent a majority of ancestral documents at each stage of transmission than vice versa. But the presumption is too minute to weigh against the smallest tangible evidence of other kinds. Experience verifies what might have been anticipated from the incalculable and fortuitous complexity of the causes here at work. At each stage of transmission the number of copies made from each MS depends on extraneous conditions, and varies irregularly from zero upwards: and when further the infinite variability of chances of preservation to a future age is taken into account, every ground for expecting a priori any sort of correspondence of numerical proportion between existing documents and their less numerous ancestors in any one age falls to the ground. This is true even in the absence of mixture; and mixture, as will be shown presently (§§ 61, 76), does but multiply the uncertainty. For all practical purposes the rival probabilities represented by relative
