Excerpt from Carcinogenesis Abstracts, Vol. 11: A Monthly Publication of the National Cancer Institute, July 1972-January 1973This change is being made so that the date of publication of material included in each issue corres ponds to the issue date. This journal is available free of charge to libraries and to individuals who have a professional interest in carcinogenesis. Requests for Carcinogenesis Abstracts from qualified individuals should include statements of their rela tionship to carcinogenesis research. All correspondence should be addressed as follows.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.