James's mother, however, not knowing these circumstances, wrote a letter to him, and sent it by a trusty messenger, directing him to watch for some opportunity to deliver it unobserved. Now there is a certain game of ball, called _tennis_, which was formerly a favorite amusement in England and on the Continent of Europe, and which, in fact, continues to be played there still. It requires an oblong enclosure, surrounded by high walls, against which the balls rebound. Such an enclosure is called a tennis court. It was customary to build such tennis courts in most of the royal palaces. There was one at St. James's Palace, where the young James, it seems, used sometimes to play. [Footnote: It was to such a tennis court at Versailles that the great National Assembly of France adjourned when the king excluded them from their hall, at the commencement of the great Revolution, and where they took the famous oath not to separate till they had established a constitution, which has been so celebrated in history as the Oath of the Tennis Court.] Strangers had the opportunity of seeing the young prince in his coming and going to and from this place of amusement, and the queen's messenger determined to offer him the letter there. He accordingly tendered it to him stealthily, as he was passing, saying, "Take this; it is from your mother." James drew back, replying, "I can not take it. I have promised that I will not." The messenger reported to the queen that he offered the letter to James, and that he refused to receive it. His mother was very much displeased, and wondered what such a strange refusal could mean. Although James thus failed to receive his communication, he was allowed at length, once or twice, to have an interview with his father, and in these interviews the king recommended to him to make his escape, if he could, and to join his mother in France. James determined to obey this injunction, and immediately set to work to plan his escape. He was fifteen years of age, and, of course, old enough to exercise some little invention. He was accustomed, as we have already stated, to join the younger children in games of hide and go seek. He began now to search for the most recondite hiding places, where he could not be found, and when he had concealed himself in such a place, he would remain there for a very long time, until his playmates had given up the search in despair. Then, at length, after having been missing for half an hour, he would reappear of his own accord. He thought that by this plan he should get the children and the attendants accustomed to his being for a long time out of sight, so that, when at length he should finally disappear, their attention would not be seriously attracted to the circumstance until he should have had time to get well set out upon his journey.