PLACE on the table a large jar of plain untinted glass; fill it two-thirds full of water and before the class assembles drop in a few drops of tincture of iron. This receptacle we will call the Human Heart. Secure a two-ounce bottle, paint it red, in which you place a strong solution of oxalic acid. You cannot get this solution too strong. This represents the Blood. Secure a third bottle and paint it black. In this place some powdered nut galls. This represents Sin. On the table have,--a silver coin, a music box, a cup of pure water. These you will use in the body of the lesson later. Announce that you will choose a text for your talk this time and it will be found in I John 1:17. "The blood of Jesus Christ, His Son, cleanseth us from all sin." Call attention to the large jar which represents the Human Heart. To all appearance it looks as pure as a lily. There seems to be nothing in it to make it evil. It does not look like evil. So it often happens that the evil in us, does not always show on the surface, but is hidden away in our heart. It was born in us. All men are not _born_ sinners, but _born_ in sin, and later on, that sin manifests itself, and we begin to choose evil in preference to the right, and that makes us sinners. The seed of sin was hidden deep in the heart. The jar apparently pure has in it a hidden property no eye can see, but it is there and when evil gets in it finds a response from that hidden power and at once the apparently pure water has turned black with sin. I now pour a few drops from the black bottle, the evil bottle, into the jar. Even these few drops seem to be clear and white also, but when I drop them into the jar of water, all is blackened because the apparent cleanness was only on the surface. "There is a way that seemeth right in the eyes of men, but the ways thereof are the ways of death." You can now talk about things which men do which they say are not bad. They look all right, that is true, but when they enter the soul, they soil it, and sin is supreme. What shall I do to get rid of my sin? What can take away my sin? Can I purchase my salvation? Let us see. Now cast in the jar a number of silver coins, and say these will bring me the white again, but the blackness is yet there, showing that salvation cannot be bought with silver or gold. Can education or refinement take away sin? Let us see. Place over the top of the jar a number of school books to represent education. Of course you see the water is yet black, because you cannot make a black heart clean by learning. Will music take away my black sin? Let us see. Place a music box on top of the jar, and let the music sound forth, but you note the heart is still black and will remain black notwithstanding the finest music of the world. Shall I say the power of the mind can take the blackness away? Let us see. I will say to myself "There is no blackness in this jar. It is a mental delusion. I am mistaken. I don't