This reference work provides an index to biographical and portrait information for 7,475 scientists. The book meticulously lists individuals from ancient times to the modern era, drawing from 338 distinct works. It serves as a crucial tool for researchers seeking to locate detailed accounts and visual representations of scientific figures throughout history.

This index is a specialized reference tool designed for researchers and historians of science. Its value lies in its comprehensive compilation of biographical and portrait data across a wide range of scientific figures and historical periods. The work's utility is directly tied to the accessibility and breadth of the 338 source materials it references, making it an essential starting point for in-depth biographical research on scientists.