Tyndall was the only physicist that I had ever met who had known Faraday personally. He was Faraday’s co-worker in the Royal Institution for many years, and to him and Maxwell I owe my earliest knowledge of Faraday’s wonderful personality. Tyndall conducted me into that knowledge by word of mouth, and his conversation about Faraday’s personality and scientific temperament thrilled me. I told him that I had bought in a Cambridge second-hand book-shop three volumes of Faraday’s “Electrical Researches” for three shillings, and Tyndall remarked: “Faraday is still quite cheap at Cambridge.” Then, after some meditation, he added: “Read them; their story is just as new and as stirring to-day as it was when these volumes were first printed. They will help you much to interpret Maxwell.” He presented me with a copy of his story, “Faraday as a Discoverer,” which closes with the words: “Just and faithful knight of God.” In this book Tyndall drew the same picture of Faraday which Campbell had given me of Maxwell. One can imagine what it meant to the world to bring these two spiritual and intellectual giants into personal contact during the period of 1860-1865, when Maxwell was professor at King’s College, London, and Faraday was at the Royal Institution, where he had been for nearly sixty years. It was significant that at the close of that period, that is, in January, 1865, Maxwell, in a letter to an intimate friend, said this: “I have a paper afloat, with an electromagnetic theory of light, which, till I am convinced to the contrary, I hold to be great guns.” A very strong claim made by the most modest of men! The paper was presented during that year to the Royal Society and was “great guns.” It marks, like Newton’s discovery of the law of gravitation and his formulation of the laws of dynamics, a new epoch in science. In Maxwell I saw a Newton of the electrical science, but I confess that in those days nothing more substantial than my youthful enthusiasm justified me in that opinion. I was aware that my knowledge of Faraday’s discoveries and of Maxwell’s interpretation of them was quite hazy, and I made up my mind to get more light before I started out for Berlin.