"It's a very pretty ball, though," said Miss Harson, "with a smooth skin and tinged with red or yellow, like a ripe apple. If it is cut open, a number of granules are seen, each containing a grub embedded in a fruit-like substance. The grub undergoes its transformation, and in due course emerges a perfect insect. These pretty pink-and-white apples used to be gathered by English boys on the twenty-ninth of May, which was called 'Oak-Apple Day.'"