ABSTRACT
The author received several invitations to lecture at other universities. One of these was Edinburgh, where the chair of theoretical physics the official title was Tait Chair of Natural Philosophy was held by his old friend Charles Galton Darwin. Author's lecture on non-linear electrodynamics was received well, and he had a pleasant time in the house of Charles and his wife Catherine. They drove him to see sights of Edinburgh and the surrounding country and he remembers how impressed he was by the rocky hill called Arthur's Seat just inside the city, by the Forth Bridge and by the bare, steep Pentland Hills. Author's department in Drummond Street was quite near to the main University building, Old College, in one of the many dark, depressing slum districts. It contained two scientific departments, that of experimental physics or 'natural philosophy', as physics is traditionally called in Scotland, and that of 'applied mathematics', attached to his 'Tait Chair of Natural Philosophy'.
