Erratum.
In my recent paper "Concerning the Theory of Photoconductivity in Infrared-sensitive Semiconducting Films" (Science, 1950, 111) page 685, line 7, column 2, should read ". . . to essentially pictures (1) or (2). . . ." rather than ". . . pictures (10) or (5). . . " On page 687, line 5, column, 1, the words "fixed," "positive," and "electrons" should be deleted.
Rittner
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