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* Received for publication May 9, 1958. The research was done at the Air Crew Equipment Laboratory, Philadelphia, under Project TED NAM AE-7047, Human Engineering Investigations of Aircraft Cockpit Visual Displays; Part 18: Size and Shape of Numerals and Letters for Displays. 'J. E. Hochberg, Henry Gleitman, and P. D. McBride, Visual threshold as a function of simplicity of form, Amer. Psychologist, 3, 1948, 341-342 (abstract); M. E. Bitterman, John Krauskopf, and J. E. Hochberg, Threshold for visual form: A diffusion model, this JOURNAL, 67, 1954, 205-219; John Krauskopf, R. A. Duryea, and M. E. Bitterman, Threshold for visual form: Further experiments, this JOURNAL, 67, 1954, 427-440. 2 R. C. Casperson, The visual discrimination of geometric forms, J. exp. Psychol., 40, 1950, 668-681; Harry Helson and E. V. Fehrer, The role of form in perception, this JOURNAL, 44, 1932, 79-102; H. E. King, Carney Landis, and Joseph Zubin, Visual subliminal perception where a figure is obscured by the illumination of the ground, J. exp. Psychol., 34, 1944, 60-69; Nathaniel Kleitman and Z. A. Blier, Color and form discrimination in the periphery of the retina, Amer. J. Physiol., 85, 1928, 178-190; N. L. Munn and G. A. Geil, A note on peripheral form discrimination, J. gen. Psychol., 5, 1931, 78-88. 3 G. A. Fry, The relation of the configuration of a brightness contrast border to its visibility, J. opt. Soc. Am., 37, 1947, 166-175. 4 J. J. Gibson, The reproduction of visually perceived forms, J. exp. Psychol., 12, 1929, 1-39. 236

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