l see by the engraving, where light can come in.

The margin of the opening is formed of an immense brass ring. Such a
ring is necessary in a structure like this, and it must be of great
thickness and strength, to resist the pressure of the stones crowding in
upon it all around.

This Pantheon was built by the ancient Romans, two thousand years ago.
What it was built for originally nobody now knows. In modern times it
has been changed into a church. It is immensely large, being nearly a
hundred and fifty feet in diameter, and a hundred and fifty feet high.
If you will inquire and ascertain what is the size of some large
building in your vicinity, and compare it with these dimensions, you
will form a clearer idea of the magnitude of this ancient edifice than
you can acquire in any other way.

Rollo and his party rambled about the Pantheon, looking at the statues,
and paintings, and chapels, and observing the groups of pilgrims and of
visitors that were continually coming and going, for nearly an hour. By
this time the shower had entirely passed away, and the sun having come
out bright, they all walked home.

CHAPTER IX.

GOING TO OSTIA.

While Rollo was at Rome, he made the acquaintance of a boy named Copley.
Copley was an English boy, and he was about a year older than Rollo.
Rollo first saw him at the door of the hotel, as he, Copley, was
dismounting from his horse, on his return from a ride which he had been
taking into the country. He had been attended on his ride by a servant
man named Thomas. Thomas dismounted from his horse first, and held the
bridle of Copley's horse while Copley dismounted.

"There!" said Copley, walking off with a very grand air, and leaving his
horse in Thomas's hands; "take the horse, Thomas, and never bring me
such an animal as that again. Next time I ride I shall take Jessie."

"But Mr. William has forbidden me to give you Jessie," said Thomas. "He
says she is not safe."

"It's none of his business," said Copley. "He thinks, because he is a
little older than I am, and because he is married,--though he has not
been married much more than a month,--that he has a right to order me
about just as he pleases. And I am determined not to submit to it--would
you?"

These last words were addressed to Rollo. Copley had been advancing
towards the door of the hotel, while he had been speaking, and had now
just reached the step where Rollo was standing.

"Who is he?" asked Rollo. "W