"Can I go up with you and see the lantern?" he asked.
"Oh yes," said Dave, leading Bart up the iron stairway that mounted from room to room.
"There!" said Bart, looking round on the glass windows enclosing the lantern and the lamp in its centre: "I think this is a dreadful interestin' place."
"I think so too, Bart."
"And what I think is interestin' is that lamp in the centre. Why, granny uses a lamp that, it seems to me, is no bigger than that, but it can't throw anywhere near such a light as that. I saw your light last night."
"You did? where?"
"From the hill behind our house. I went up there and saw it."
"I did not know that. Then we could signal to one another."
"Signal?"
"Yes, this way. Supposing, now, I should hang a lantern out on the side of the lighthouse toward the land, toward your home, and you could see it: you might take it as a sign that I wanted--well--we will say--a doctor."