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 the "vraisemblance" which is of the essence of such a drawing. Even in this case, however, the line ought to be very carefully considered. It is important to recollect that the type establishes a sort of scale of its own, and, taking ordinary lettering, this would exclude very minute work where the lines are close together and there is much cross-hatching; and also simple outline work such as Retsch used to labour at, for the latter errs on the side of tenuity and meagreness as much as process-reproduction of brush-work sins in the opposite extreme. The line used in architectural illustration should be free, accurate, and unfaltering, drawn with sufficient technical knowledge of architecture to enable the draughtsman to know where he can stop without injury to his subject. The line should not be obstinate, but so light and subtle as to reflect without effort each thought that 243