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By Harold Jeffreys

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Nevertheless, it may be well, while not attempting to deal fully with the matter, at least to inquire how far the calculus is able to help. In practice, the fact of one extant manuscript being a copy, mediate or immediate, of some other, is often apparent from evidence of which the calculus is unable to take account, and the elimination of derivatives is perhaps not generally a very difficult task. The test, a useful if incomplete one, that the calculus affords for the detection of derivatives is the absence of type-l variants.

Nevertheless, it may be well, while not attempting to deal fully with the matter, at least to inquire how far the calculus is able to help. In practice, the fact of one extant manuscript being a copy, mediate or immediate, of some other, is often apparent from evidence of which the calculus is unable to take account, and the elimination of derivatives is perhaps not generally a very difficult task. The test, a useful if incomplete one, that the calculus affords for the detection of derivatives is the absence of type-l variants.

The Calculus qf Variants Method and L£m'italions calculus can, nevertheless, help us by establishing an order of merit among the manuscripts. To do this we take our completed list of simple readings and analyse it to ascertain the number of necessarily original (or unoriginal) readings in each manuscript, extant or inferential. The evidential value of each manuscript, or group of manuscripts, thus receives numerical expression. To illustrate this, take once more the family (x)A'A{B[C(DEF)]}. In this any group of two or more manuscripts including A must preserve the reading of the archetype; while, if A is unavailable, any group of two or more including B must preserve the reading of xA'BCDEF, which is as near to the original as we can get.

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Asymptotic approximations by Harold Jeffreys


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