are appropriate for the evaluation of such a wide variety of discourse. When judged by literary criteria the literary efforts of artists are found to range from the grotesque to the polished and, at times, the elegant. For examples of this stylistic range one need only compare the Dada manifestoes with Delacroix's Journal. When judged by philosophical criteria the generalizations of artists rank from the superficial, and occasionally the incoherent, to the profound. This intellectual gamut is readily noted by comparing a random sample of the flood of statements by contemporary artists published in catalogues and magazines with Leonardo's Notebooks. When judged by educational criteria treatises on art run from the highly specific to the broadly theoretical. One thinks of Cennini's Book of the Art, the original
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David W. Ecker (1963) studied this question.