The heralds blew a joyous blast on their trumpets and went to fetch the Princess Agnes. Arthur found himself thinking of little Margot at the inn, and how sadly she had looked after him when he went away. But he knew that, being a hero, he must accept the responsibilities of that position and marry the Princess. He felt nervously in his wallet for the magic glass, for he said to himself:
"Since I must marry this giantess, between whom and me is little love, let me be sure that I can make her small like myself; else there will be no happiness in my family. As soon as we are wed I will stare at the big girl until she shrinks into the proper size, as did Oscar and the Dragon."
Arthur felt into the corners of his wallet for the magic glass--but it was not there! Hurriedly he searched again. It was gone! What was to be done? Must he, then, marry the giant girl and be a slave to her cruel temper all his life? Horrible thought! What had become of the glass? Suddenly he remembered Oscar, who had also been put into the wallet. Oscar likewise was gone!
Arthur saw what had happened. With his little dagger Oscar had cut the threads which bound him and had escaped, taking the magic glass with him.
"What makes your face so pale, brave Arthur?" asked the King jokingly. "Is it the thought of your dainty little bride?"
Even as Arthur opened his lips to answer, there came a shrill cry from beneath his very nose. Looking down he saw Oscar standing on the table and peering over his beaker of wine. In both arms he held the magic glass, and he was turning its shining eye upon Arthur himself.
"Revenge!" cried the little fellow, fiercely. "Revenge! I have learned his secret. I will gaze him smaller and smaller, until he goes out. Nothing can save him!"
Before Arthur could move, Oscar pressed his face to the glass and began to stare as through a window, his malicious eyes fixed upon Arthur's face. With horror Arthur waited to feel himself shrink. He looked about fearfully at the other guests, expecting to see them appear to swell into giants as he himself grew tiny. He stared at Oscar again, who should now seem larger than himself.
But what was this? Nothing happened. The guests were staring open-mouthed with surprise, but they were of the usual size, Oscar was still a tiny dwarf. Arthur rubbed his eyes and looked again. Still nothing happened. The glass seemed to have lost its magic!
Suddenly, Arthur saw what it meant. The magic of the glass was to last only for three trials. Once, before he knew its worth, he had wasted it upon the spider, the rat, and the singing bird. Once the Dragon had felt its power. Its third and last spell had turned Oscar into a midget. Now its virtue was gone. It was but a piece of ordinary crystal, and Oscar's wicked plan was foiled!