"The Æsir will judge whether my brother's work is not the best that ever came out of Svartheim. And they will see to it that you will pay your wager, Loki, the head off your shoulders. Will ye not sit in judgment, O Dwellers in Asgard?" "We will sit in judgment," said the Æsir. Then, still full of rage, Brock the Dwarf went down to Svartheim, and to the place where his brother Sindri worked. There was Sindri in his glowing forge, working with bellows and anvil and hammers beside him, and around him masses of metal--gold and silver, copper and iron. Brock told his tale, how he had wagered his head against Loki's that Sindri could make things more wonderful than the spear and the boat that Loki had brought into Asgard. "You were right in what you said, my brother," said Sindri, "and you shall not lose your head to Loki. But the two of us must work at what I am going to forge. It will be your work to keep the fire so that it will neither blaze up nor die down for a single instant. If you can keep the fire as I tell you, we will forge a wonder. Now, brother, keep your hands upon the bellows, and keep the fire under your control." Then into the fire Sindri threw, not a piece of metal, but a pig's skin. Brock kept his hands on the bellows, working it so that the fire neither died down nor blazed up for a single instant. And in the glowing fire the pigskin swelled itself into a strange shape. But Brock was not left to work the bellows in peace. In to the forge flew a gadfly. It lighted on Brock's hands and stung them. The Dwarf screamed with pain, but his hands still held the bellows, working it to keep the fire steady, for he knew that the gadfly was Loki, and that Loki was striving to spoil Sindri's work. Again the gadfly stung his hands, but Brock, although his hands felt as if they were pierced with hot irons, still worked the bellows so that the fire did not blaze up or die down for a single instant. Sindri came and looked into the fire. Over the shape that was rising there he said words of magic. The gadfly had flown away, and Sindri bade his brother cease working. He took out the thing that had been shaped in the fire, and he worked over it with his hammer. It was a wonder indeed--a boar, all golden, that could fly through the air, and that shed light from its bristles as it flew. Brock forgot the pain in his hands and screamed with joy. "This is the greatest of wonders," he said. "The Dwellers in Asgard will have to give the judgment against Loki. I shall have Loki's head!" But Sindri said, "The boar Golden Bristle may not be judged as great a wonder as the spear Gungnir or the boat Skidbladnir. We must make something more wonderful still. Work the bellows as before, brother, and do not let the fire die down or blaze up for a single instant."