Then he begins to laugh, and shakes his sides and says to his friends, “Well, they have done just the same thing I did, precisely”--and that spoils the whole joke, for you and I have done the same thing he did, and while we sit here and laugh at him he has a better right to sit out there and laugh at us. I know I have made the same mistakes, but, of course, that does not make any difference, because we don’t expect the same man to preach and practise, too. As I come here to-night and look around this audience I am seeing again what through these fifty years I have continually seen-men that are making precisely that same mistake. I often wish I could see the younger people, and would that the Academy had been filled to-night with our high-school scholars and our grammar-school scholars, that I could have them to talk to. While I would have preferred such an audience as that, because they are most susceptible, as they have not grown up into their prejudices as we have, they have not gotten into any custom that they cannot break, they have not met with any failures as we have; and while I could perhaps do such an audience as that more good than I can do grown-up people, yet I will do the best I can with the material I have. I say to you that you have “acres of diamonds” in Philadelphia right where you now live. “Oh,” but you will say, “you cannot know much about your city if you think there are any ‘acres of diamonds’ here.” I was greatly interested in that account in the newspaper of the young man who found that diamond in North Carolina. It was one of the purest diamonds that has ever been discovered, and it has several predecessors near the same locality. I went to a distinguished professor in mineralogy and asked him where he thought those diamonds came from. The professor secured the map of the geologic formations of our continent, and traced it. He said it went either through the underlying carboniferous strata adapted for such production, westward through Ohio and the Mississippi, or in more probability came eastward through Virginia and up the shore of the Atlantic Ocean. It is a fact that the diamonds were there, for they have been discovered and sold; and that they were carried down there during the drift period, from some northern locality. Now who can say but some person going down with his drill in Philadelphia will find some trace of a diamond-mine yet down here? Oh, friends! you cannot say that you are not over one of the greatest diamond-mines in the world, for such a diamond as that only comes from the most profitable mines that are found on earth.