Acknowledgments
The editor wishes to express his appreciation for special technical and editorial assistance to: Dr. Klaus Biemann, Massachusetts Institute of Technology; Dr. Ira Blei, Melpar, Incorporated; Dr. Carl Bruch, National Aeronautics and Space Administration; George Hobby, Jet Propulsion Laboratory; Dr. Norman H. Horowitz, California Institute of Technology; Dr. Thomas Jukes, University of California; Dr. Elliott Levinthal, Stanford University Medical Center; Dr. Sol Nelson, Melpar, Incorporated; Dr. Carl Sagan, Smithsonian Astrophysical Observatory and Harvard College Observatory; Dr. Gerald Soffen, Jet Propulsion Laboratory; Dr. Wolf Vishniac, University of Rochester; and Dr. Robert Kay, Philco Research Laboratories.
The entire text has been reviewed by Drs. Horowitz and Sagan.
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