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Previous Volume 331:817-818 September 22, 1994 Number 12 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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By R. Steven Turner. 338 pp. Princeton, N.J., Princeton University Press, 1994. $49.50. ISBN 0-691-03397-8.

During the second half of the 19th century in Germany, two schools of physiology disputed the nature of human visual perception. Heading the more established school was one of the most famous scientists of the time, Hermann von Helmholtz (1821 to 1894); leading the other group was the imposing Ewald Hering (1834 to 1918). The two protagonists and their schools disagreed on many scientific issues of the day, but none was to acquire as much notoriety as the controversy regarding the visual perception of space, depth, color, and contrast. Out of a very personal dispute, a change in scientific thought . . . [Full Text of this Article]

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