Rollo had an opportunity to experience the advantages of the London system of police three or four days after this, in an emergency, which, as I am now speaking of the policemen, I will mention here. He had been to see the British Museum with his uncle George, and had undertaken to find his way back to the lodgings in Northumberland Court alone, his uncle having had occasion at that time to go in another direction. The distance from the museum to Northumberland Court was only about a mile; but the intervening streets were very short, narrow, and intricate, and were inclined towards each other at all possible angles, so that Rollo very soon lost his way. In fact, he soon became completely turned round; and, instead of going towards Northumberland Court, he went wandering on in exactly a contrary direction. He turned this way and that, and looked at the names of the streets on all the corners, in hopes to find some one he had heard of before. Finally he became completely bewildered. "I shall have to give it up," said he to himself. "If it was a pleasant day, I could go by the sun; for by keeping to the south I should, sooner or later, come to the river." Unfortunately for Rollo, as is usually the case in London, the sun was not to be seen. The sky was obscured with an impenetrable veil of smoke and vapor. "I'll take a cab," said Rollo, "at the first stand, and tell the cabman to drive me to Northumberland Court. He must find where it is the best way he can." Rollo put his hands in his pockets as he said this, and found, to his consternation, that he had no money. He had left his purse in the pocket of another suit of clothes at home. He immediately decided that he must give up the plan of taking a cab, since he had no money to pay for it. This difficulty, however, was, in fact, by no means insuperable, as he might have taken a cab, and paid the fare when he arrived at his lodgings, by asking the man to wait at the door while he went up to get his purse. He did not, however, think of this plan, but decided at once that he must find some other way of getting home than by taking a cab. "I will ask a policeman," said he. So he began to look about for a policeman; and as there are so many thousands of them on duty in London, one can almost always be very readily found; and, when found, he is instantly known by his uniform. Rollo met the policeman walking towards him on the sidewalk. "I want to find my way to Northumberland Court," said he. "Will you be good enough to tell me which way to go?" The policeman looked at Rollo a moment with a kind and friendly expression of countenance. "Why, it is two miles and a half from here," said he, "at least, and a very difficult way to find. I think you had better take a cab." "But I have not any money," said Rollo.