Excerpt from Carcinogenesis Abstracts, Vol. 17: A Monthly Publication Sponsored by the National Cancer Institute Clelland, R. C. (dept. Statistics, Wharton Sch Univ. Pennsylvania, Philadelphia, pa); Bowers, E. J. Chem Eng News 4; 1979. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.