William Robson

William Robson was a researcher at the University of Edinburgh who, working with Charlotte Auerbach in the early 1940s, helped establish that a chemical could alter hereditary material. Their mustard-gas experiments produced permanent chromosome abnormalities and mutations, marking the discovery of the first chemical mutagen.

Research at Edinburgh

Robson’s documented role is defined by a specific collaboration: he and Charlotte Auerbach investigated mustard gas at the University of Edinburgh in the early 1940s. Their finding belonged to a field then being transformed by research into radiation-induced genetic change. The book presents their work as a less noticed companion discovery, distinct in its agent but closely connected to that emerging understanding of mutation.

Mustard Gas and Mutation

The researchers found that mustard gas produced permanent chromosome abnormalities. These abnormalities could not be distinguished from those induced by radiation, linking the effects of a chemical agent to the visible genetic damage associated with radiation. The experiments also tested mustard gas on fruit flies, the same organism Hermann J. Muller had used in his original work with X-rays; the gas produced mutations in those flies as well.

Significance

The work established mustard gas as the first discovered chemical mutagen. In the book’s account, this was not an isolated result: a long list of other chemicals had subsequently become known to alter genetic material in plants and animals. Robson’s contribution therefore marks an important threshold in the discussion of heredity—the recognition that chemicals, as well as radiation, can change the course of genetic transmission.