The zealous care with which J. M. W. Turner endeavoured to do his duty, is proved by a large existing series of drawings, exquisitely tinted, and oft… - John Ruskin

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The zealous care with which J. M. W. Turner endeavoured to do his duty, is proved by a large existing series of drawings, exquisitely tinted, and often completely coloured, all by his own hand, of the most difficult perspective subjects—illustrating not only directions of line, but effects of light - with a care and completion which would put the work of any ordinary teacher to utter shame. In teaching generally — he would neither waste time nor spare it - he would look over a student's drawing at the Academy, point to a defective part, make a scratch on the paper at the side, say nothing. If the student saw what was wanted, and did it, Turner was delighted; but if the student could not follow. Turner left him.