On Sunday, Sept. 4, 1870, Martin Harris addressed a congregation of Saints in Salt Lake City. He related an incident which occurred during the time that he wrote that portion of the translation of the Book of Mormon which he was favored to write direct from the mouth of the Prophet Joseph Smith, and said that the Prophet possessed a seer stone, by which he was enabled to translate as well as from the Urim and Thummim, and for convenience he then used the seer stone. Martin explained the translation as follows: By aid of the seer stone, sentences would appear and were read by the Prophet and written by Martin, and when finished he would say, “Written,” and if correctly written, that sentence would disappear and another appear in its place; but if not written correctly it remained until corrected, so that the translation was just as it was engraven on the plates, precisely in the language then used. Martin said that after continued translation they would become weary, and would go down to the river and exercise by throwing stones out on the river, etc. While so doing, on one occasion, Martin Harris found a stone very much resembling the one used for translating, and on resuming their labor of translation, he put in place the stone that he had found. He said that the Prophet remained silent, unusually and intently gazing in darkness, no traces of the usual sentences appearing. Much surprised, Joseph excla[i]med, “Martin! What is the matter! All is as dark as Egypt!” Martin’s countenance betrayed him, and the Prophet asked Martin why he had done so. Martin said, to stop the mouths of fools, who had told him that the Prophet had learned those sentences and was merely repeating them, etc. Martin said further that the seer stones differed in appearance entirely from the Urim and Thummim obtained with the plates, which were two clear stones set in two rims, very much resembling spectacles, only they were larger. Martin said, there were not many pages translated while he wrote, after which Oliver Cowdery and others did the writing.