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THIS paper reports a limited series of tests for carcinogenic action on mouse skin of tar obtained from cigarette smoke. Since the evidence that cigarette tars are carcinogenic has come from only one group in one country it seems desirable that results of other workers should be presented as soon as possible so that the position can be better evaluated. The experiments described here failed to reveal any carcinogenic action under the conditions of the test.

Biological Tests for Carcinogenic Action of Tar from Cigarette Smoke