Uncle Paul took from his desk a stick of sealing-wax and rubbed it rapidly over his cloth sleeve; then he put it near a small piece of paper. The children were all eyes. Behold, the paper flies up and sticks to the sealing-wax. The experiment is repeated several times. Each time the paper rises unaided, starts off, and fastens on to the stick. “The piece of sealing-wax, which formerly did not attract the paper, now does. The rubbing on the cloth has, then, developed in it something that cannot be seen, for the stick has not changed in appearance; and this invisible thing is nevertheless very real, since it can lift up the paper, draw it to the wax, and hold it glued there. This thing is called electricity. You can easily produce it by rubbing on cloth either a piece of glass or a stick of sulphur, resin, or sealing-wax. All these substances, when rubbed, will acquire the property of drawing to themselves very light objects, like small pieces of straw, little bits of paper, or particles of dust. This evening the cat shall teach us more about it, if it will be good.” ------------------------------------------------------------------------ CHAPTER XXXVI THE EXPERIMENT WITH THE CAT THE wind blew cold and dry. The storm of the day before had brought it on. Uncle Paul took this pretext to have the kitchen stove lighted in spite of Mother Ambroisine’s remarks, who cried out at the unseasonableness of making a fire. “Light up the stove in summer!” said she; “did one ever see the like? No one but our master would have such a notion. We shall be roasted.” Uncle Paul let her talk; he had his own idea. They sat down at the table. After eating its supper the big cat, never too warm, settled itself on a chair by the side of the stove, and soon, with its back turned to the warm sheet-iron, began to purr with happiness. All was going as desired; Uncle Paul’s projects were taking an excellent turn. There was some complaint of the heat, but he took no notice. “Ah! do you think it is for you the stove is lighted?” said he to the children. “Undeceive yourselves, my little friends: it is for the cat, the cat alone. It is so chilly, poor thing; see how happy it is on its chair.” Emile was on the point of laughing at his uncle’s kindly attentions to the tom-cat, but Claire, who suspected serious designs, nudged him with her elbow. Claire’s suspicions were well founded. When they had finished supper they resumed the subject of thunder. Uncle Paul began: “This morning I promised to show you, with the cat’s help, some very curious things. The time has come for keeping my word, provided Puss is agreeable.” He took the cat, whose hair was burning hot, and put it on his knees. The children drew near. “Jules, put out the lamp; we must be in the dark.”