Teachers' manual for the Prang course in drawing for graded schools, books 1-6 (1897)
Clark, John Spencer, Prang Company, Hicks Mary D, Perry, Walter Scott · Boston. Prang educ. co. · leaf 180
upils. The expression of masses of light anddark is not quite the same thing as theexpression of observed effects of light andshade. Effects of light and dark may becaused either by differences in the illumination of objects and parts of objects or byactual differences in their individual or local…
Drawing -- Study and teaching
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