would from their peculiar character especially gather around them matter of this kind. Here it is the business of the critic to exercise discernment and reasoning on the facts which research has in each case brought forward, in order to discriminate the incrustation from the original substance, and the germ amidst the motley growth that overlies it. Corruption may also be the work of wilful tamperings; and what is possible must not be left out of sight by the critic. Whether such a process has been
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