"What poetry is that?" said Rollo.
"It is part of some old song," said Mr. George. "Look down the river and you can see these boats cruising about among the shipping."
"Is that the way they get across the river below here?" said Rollo.
"Yes," said Mr. George; "and then there is
the Tunnel besides. They can go under the river through the Tunnel if they please, about a mile and a half below here."
"Is that the reason why they made the Tunnel," said Rollo, "because they could not have any bridge?"
"Yes," said Mr. George. "It would have been a great deal cheaper and better to have made a bridge; but a bridge would have interfered with the shipping, and so they made a tunnel underneath."
"I never knew before," said Rollo, "why they made the Tunnel."
"Yes," said Mr. George, "that is the reason. It was a very difficult and expensive work; but I believe it proved a failure. Very few people use it for crossing the river, though a great many go to see it. It is a curious place to see. But now let us go across the bridge and see what is on the other side."
Mr. George and Rollo had to stand several minutes on the curbstone of the sidewalk before they could find openings, in the trains of vehicles which were moving to and fro over the bridge, wide enough to allow them, to pass through to the other side. At length, however, they succeeded in getting across; and, after walking along on the upper side of the bridge for some distance