Another scientific friend, Mr. W. F. Barrett, writes:--"My first interview with Mr. Faraday ten years ago left an impression upon me I can never forget. Young student as I then was, thinking chiefly of present work and little of future prospects, and till then unknown to Mr. Faraday, judge of my feelings when, taking my hand in both of his, he said, 'I congratulate you upon choosing to be a _philosopher_: it is an arduous life, but a noble and a glorious one. Work hard, and work carefully, and you will have success.' The sweet yet serious way he said this made the earnestness of work become a very vivid reality, and led me to doubt whether I had not dared to undertake too lofty a pursuit. After this Mr. Faraday never forgot to remember me in a number of thoughtful and delicate ways. He would ask me upstairs to his room to describe or show him the results of any little investigation I might have made: taking the greatest interest in it all, his pleasure would seem to equal and thus heighten mine, and then he would add words of kind suggestion and encouragement. In the same kindly spirit he has invited me to his house at Hampton Court, or would ask me to join him at supper after the Friday evening's lecture. His kindness is further shown by his giving me a volume of his researches on Chemistry and Physics, writing therein, 'From his friend Michael Faraday.' Those who live alone in London, unknown and uncared-for by any around them, can best appreciate these marks of attention which Mr. Faraday invariably showed, and not only to myself, but equally to my fellow-assistant in the chemical laboratory." The following instance among many that might be quoted will illustrate his readiness to take trouble on behalf of others. When Dr. Noad was writing his "Manual of Electricity," a doubt crossed his mind as to whether Sir Snow Harris's unit jar gave a true measure of the quantity of electricity thrown into a Leyden jar: he asked Faraday, and his doubt was confirmed. Shortly afterwards he received a letter beginning thus:-- "MY DEAR SIR, "Whilst looking over my papers on induction, I was reminded of our talk about Harris's unit jar, and recollected that I had given you a result just the _reverse_ of my old conclusions, and, as I believe, of the truth. I think the jar _is a true measure_, so long as the circumstances of position, &c., are not altered; for its discharge and the quantity of electricity thus passed on depends on the constant relation of the balls connected with the inner and outer surface coating to each other, and is independent of their joint relation to the machine, battery, &c.... Perhaps I have not made my view clear, but next time we meet, remind me of the matter. "Ever truly yours, "M. FARADAY."