In 1963, the first edition of Chemistry of Viruses was published as a contribution to the series on viruses sponsored by Protoplasmatologia. An aim of the first edition was to review some major principles and techniques of chemical virology in a concise manner and to accompany this review with a compilation of pertinent references. It was anticipated that this exercise would be helpful to the author in his teaching and research and, hopefully, would be useful to readers as well. The literature of virology has grown enormously since then, and it is even more urgent to have a succinct survey....