Stuk 24 - Letter from James Challis

Cambridge - Has sent WW his article, 'Source and Maintenance of the Sun's Heat' just published in the Philosophical Magazine, and three earlier papers containing the theories of Electricity, Galvanism, and Magnetism. Did not think WW was aware that he had 'theories which bear on the distinction between galvanism and magnetism, and the laws of the mutual action of these two kinds of Forces'. The explanations of these laws depends on the solutions of hydrodynamical problems.