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I mention this circumstance for the purpose of showing that no other occasion could occur better calculated to elicit appropriate instruction; recall the results of past experience; & prescribe the requisite exact details, necessary for immediate use. And as language alone frequently fails in such communications, my [[strike through]] practice [[/strike through]] custom was to write down the lesson I had given, & then read to, and catechize the pupil, regarding it correctness and sufficiency.

It is scarcely possible for an Artist, after years of practice, even the most successful, to recollect all the means by which he learned gradually to accomplish the best results of his pencil, unless he has constantly at his side a Pupil in whose progress he is interested, & whose difficulties, similar to what he had himself experienced, to revive his memory, & demand of him that he should act as a fellow pupil in explanation of of each new requisite.