The ninth day of his experiments was October 28, and this day he “made a copper disc turn round between the poles of the great horse-shoe magnet of the Royal Society. The axis and edge of the disc were connected with a galvanometer. The needle moved as the disc turned.” The next day that he made experiments, November 4, he found “that a copper wire one-eighth of an inch drawn between the poles and conductors produced the effect.” In his paper, when describing the experiment, he speaks of the metal “cutting” the magnetic curves, and in a note to his paper he says, “By magnetic curves I mean lines of magnetic forces which would be depicted by iron filings.” [Sidenote: SUCCESS AND ITS SECRET.] We here come upon those “lines of force” which played so important a part in these and many of Faraday’s later investigations. They were known before Faraday’s time--had, in fact, been known for two hundred years. Descartes had seen in them evidence for his hypothetical vortices. Musschenbroek had mapped them. But it was reserved to Faraday to point out their true significance. To the very end of his life he continued to speculate and experiment upon them. All this splendid work had occupied but a brief ten days. Then he rearranged the facts which he had thus harvested, and wrote them out in corrected form as the first series of his “Experimental Researches in Electricity.” The memoir was read to the Royal Society on November 24, 1831, though it did not appear in printed form until January, 1832--a delay which gave rise to serious misunderstandings. The paper having been read, he went away to Brighton to take a holiday, and in the exuberance of his heart penned the following letter[23] to Phillips:-- [_M. Faraday to R. Phillips._] Brighton: November 29, 1831. DEAR PHILLIPS,--For once in my life I am able to sit down and write to you without feeling that my time is so little that my letter must of necessity be a short one and accordingly I have taken an extra large sheet of paper intending to fill it with news and yet as to news I have none for I withdraw more and more from Society, and all I have to say is about myself. But how are you getting on? are you comfortable? and how does Mrs. Phillips do; and the girls? Bad correspondant as I am, I think you owe me a letter and as in the course of half an hour you will be doubly in my debt pray write us, and let us know all about you. Mrs. Faraday wishes me not to forget to put her kind remembrances to you and Mrs. Phillips in my letter. To-morrow is St. Andrew’s day,[24] but we shall be here until Thursday. I have made arrangements to be _out_ of the Council and care little for the rest although I should as a matter of curiosity have liked to see the Duke in the chair on such an occasion.