Often in later days was his experience in lecturing made use of for the benefit of others. "If," he once remarked to a young lecturer, "I said to my audience, 'This stone will fall to the ground if I open my hand,' I should open my hand and let it fall. Take nothing for granted as known; inform the eye at the same time as you address the ear." I remember him once giving me hints on the laying of the lecture table at the Institution, and telling me that where possible he was accustomed to arrange the apparatus in such a way as to suggest the order of the experiments. An incident told me by Dr. Carpenter will illustrate some of the foregoing points. The first time he heard Faraday lecture at the Royal Institution, the Professor was explaining the researches of Melloni on radiant heat. During the discourse he touched on the refraction and polarization of heat; and to explain refraction he showed the simple experiment of fixing some coloured wafers at the bottom of a basin, and then pouring in water so as to make them apparently rise. Dr. Carpenter, who had come up from Bristol with grand ideas of the lectures at Albemarle Street, wondered greatly at the introduction of so commonplace an experiment. Of course there were many other illustrations, and beautiful ones too. He went down, however, after the lecture, to the table, and among the crowd chatting there was an old gentleman who remarked, "I think the best experiment to-night was that of the wafers in the basin." When a young lecturer, Faraday took lessons in elocution from Mr. Smart, and was at great pains to cure himself of any defect of pronunciation or manner; for this purpose he would get a friendly critic to form part of his audience. On the fly-leaves of many of the notes of his lectures are written the reminders--"Stand up"--"Don't talk quick." Indeed, in early days it was so much a matter of anxiety to him that everything in his lectures should be as perfect as possible, that he not only was accustomed to go over everything again and again in his mind, but the difficulty of satisfying himself used to trouble his dreams. I was told this, if I am not mistaken, by himself; and it goes far to explain how his discourses possessed such a fascination.