It thus appears that _logically_ criticism comprises an enormous number of operations. In describing them, with all the details necessary for the understanding of their mechanism and the reasons for their employment, we are likely to give the impression of a procedure too slow to be practicable. Such an impression is inevitably produced by every verbal description of a complicated process. Compare the time occupied in describing a movement in fencing with that required to execute it; compare the tedium of the grammar and dictionary with the rapidity of reading. Like every practical art, criticism consists in the habit of performing certain acts. In the period of apprenticeship, before the habit is acquired, we are obliged to think of each act separately before performing it, and to analyse the movements; accordingly we perform them all slowly and with difficulty; but the habit once acquired, the acts, which have now become instinctive and unconscious, are performed with ease and rapidity. The reader must therefore not be uneasy about the slowness of the critical processes; he will see later on how they are abridged in practice. III. The problem of criticism may be stated as follows. Given a statement made by a man of whose mental operations we have no experience, and the value of the statement depending exclusively on the manner in which these operations were performed; to ascertain whether these operations were performed correctly. The mere statement of the problem shows that we cannot hope for any direct or definitive solution of it; we lack the essential datum, namely, the manner in which the author performed the mental operations concerned. Criticism therefore does not advance beyond indirect and provisional solutions, and does no more than furnish data which require a final elaboration.