In the early nineteenth century, Charles Bell and François Magendie engaged in a decades-long priority dispute over the discovery of the roots of motor and sensory nerves. The constantly recalibrated arguments of its participants illuminate changes in the life sciences during that period. When Bell first wrote about the nerves in 1811, surgeon-anatomists ran small schools out of their homes, natural theology was in vogue, exchanges between British and French medical practitioners were limited by the Napoleonic Wars, and British practitioners typically rejected experimental physiology and vivisection. By the end of Magendie's career, medical science was produced in the laboratory, taught through artfully produced performances of the sort at which Magendie excelled, and disseminated through journals. It is not entirely clear which historical character, Bell or Magendie, 'won' the dispute, nor that they even had clear and consistent positions in it, but what is clear is that one style of science had won out over the other, and over the course of the dispute, pedagogy lost pride of place in medical science.Keywords: Charles Bell; François Magendie; priority dispute; anatomy; vivisection; publicationIn 1811 Charles Bell, a surgeon-anatomist trying to make his living in the crowded London medical marketplace, had a little book about the nerves and brain printed for distribution to his friends and other members of the scientific community. 1 The book contained what Bell considered to be a great discovery on the workings of the nerves and brain-the discovery that spinal nerves had a double root corresponding to two distinct and differently functioning parts of the brain, and that the double root betrayed two different kinds of nerve (later determined to be motor and sensory) that were ensheathed together in the periphery of the body. As Bell himself described it:considering that the spinal nerves have a double root, and being of opinion that the properties of the nerves are derived from their connexions with the parts of the brain, I thought that I had an opportunity of putting my opinion to the test of experiments, and of proving, at the same time, that nerves of different endowments were in the same chord, and held together by the same sheath.