. The mental life of monkeys and apes; a study of ideational behavior. Monkeys; Apes. 40 ROBERT M. YERKES. â¢Â§ J3 â c g CM E â a be a I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Yerkes, Robert Mearns, 1876-1956. Cambridge, Boston, Mass. New York, H. Holt

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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectapes, bookyear1916