"If there is going to be a shower," said Rollo, "it would be a good time to stop and see the Pantheon."
"What is the Pantheon?" asked Allie.
"It is an immense round church, with a great hole in the roof," replied Rollo.
"Why don't they mend the hole?" asked Charles.
"O, they made it so on purpose," said Rollo.
"Made it on purpose!" repeated Allie. "I never heard of such a thing. I should think the rain would come in."
"It does come in," said Rollo, "and that is the reason why I want to go and see the Pantheon in the time of a shower. It is so curious to see the rain falling down slowly to the pavement. You see, the church is round, and there is a dome over it, and in the centre of the dome they left a great round hole."
"How big?" asked Allie.
"It is twenty-eight feet across," said Rollo; "but you would not think it so big when you come to see it. It is up so high that it looks very small. We know how big it is by the size of the wet spot on the floor."
By the time that the party had arrived at this point in the conversation, Rollo saw a carriage standing in the street at a little distance before him, and he made a signal to the coachman to come to him. The coachman came. Rollo made his bargain with him, and they all got in. The coachman drove immediately to the Pantheon, and they arrived there just as the shower began to come on.