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—In the book review of The Diencephalon and Sleep that appeared in the August issue of the Archives (1991;48:785), an error appeared in the third column, lines 2 through 5. The text read as follows: "A study of spindles and potassium complexes in hemiparkinsonism provides a nice clinical complement to this section." The text should have read as follows: "A study of spindles and K complexes in hemiparkinsonism provides a nice clinical complement to this section."