Document mr16R60EgygYKeOLo30Yovjk

I i i I viii OCCUPATIONAL TUMORS AND ALLIED DISEASES An appreciable unevenness exists in the presentation of the various aspects of the individual occupational neoplasms. This is in part due to the fact that marked differences exist regarding the amount of information available for any particular type of tumor, and in part to the irregularity with which our knowledge has progressed at different times and at various points. The ap parent great complexity of the subject matter, the existence of an appreciable number of disconnected or controversial observations, and the rapid and con tinuous expansion of the borders of our knowledge, may necessitate not only modifications in the interpretations of observations recorded, but also demand that final judgment must be suspended on certain points until some future time. The extensive bibliographies conform to the reference character of the book. A fairly complete list of references is offered for the majority of in dustrial neoplasms discussed. A restricted number of publications, selected according to their relative scientific or practical value or because of some special feature, is given with those industrial tumors for which a very abundant lit erature exists. The bibliographies, in these cases however, are also of great fullness and representative in character. No attempt has been made to cover the literature comprehensively, which has been accumulated concerning the traumatic causation of neoplasms, as a great number of publications dealing with the subject are of little value. It is obvious that in the difficult task of collecting data from many sources and about widely differing aspects, errors or omissions may have occurred. The indulgence of the reader is asked in this matter and the hope is expressed that his suggestions and criticisms may assist in remedying such defects and in improving the work in the future. I wish to express my sincere gratitude to William R. Warner & Company, Inc., and especially to Mr. G. A. Pfeiffer, President, and Dr. Marvin R. Thompson, Director of the Warner Institute for Therapeutic Research, for the continued interest shown in the progress of this work and for the en couragement extended to it until its ultimate publication. W. C. H. January /, 1942 Scarsdale, N.Y. \ 4 3 "t :1 '1 .s !: vii