John Louis William Thudichum, German chemist, late 19th century.
© Science Museum / Science & Society Picture Library
Thudichum (1829-1901) was born and educated in Germany. Very early in his career he became interested in chemistry. In 1853 he moved to England owing to the war between Prusia and Denmark. In 1858 he was appointed lecturer in chemistry at the Grosvenor Place School of Medicine. In the same year he published his first book on the analysis of urine, which helped physicians to understand and diagnose many diseases. In the 1860s he investigated the effects of cholera on the brain. These investigations formed the background of his major work on the chemical constituents of the brain. He wrote over 80 scientific publications as well as 2 books, and is considered to be the founder of neurochemistry.