Letter from Geo Fras [George Francis] Fitzgerald, Trinity College Dublin, to [Joseph] Larmor Fitzgerald does not think that Larmor appreciates his question about the work done by an electron in passing in and out at different velocities along the same line. He asks what becomes of the energy given to the system. He considers stress in a conductor, and describes the experimental apparatus of a trough supported between poles by a horseshoe magnet, with a bar of iron though the middle, and its effect on induction. He outlines the experiment with a current of 20 amperes and its effect in deforming the surface of mercury. If Larmor is looking for what would cause hydrostatic pressure in a mercury column, Fitzgerald sketches an experimental set-up and its possible effects. After a long discussion, he asks if Larmor agrees that this would be a satisfactory way of testing, and if so, Fitzgerald would repeat the experiment with more carefully designed pole pieces. He returns to the electron question, suggesting a possible experimental approach using two electrolytes and powerful electromagnets. 2 March 1895