This is the first new edition of the acclaimed Dartmouth Medal-winning "Dictionary" since 1981. It integrates the 5,100 biographies from the base set with the 400 biographies found in the "Supplement," and includes photos and portraits of the most-studied scientists. Most important, the "Concise Dictionary of Scientific Biography" is comprehensively indexed by theme and subject for the first time, making it a true historical resource, and more than a compendium of biographies.