"What peculiar leaves?" said Harry, "they look like leather."
"True," said the professor, "and you notice that instead of having one surface toward the sky and the other toward the earth they are placed edgewise."
Soon they reached the mouth of the river, and there, just beyond the bar, rode the good ship Arcturus, on which the professor was to sail for Boston. His baggage was hoisted on board, and then the professor himself followed.
"Will you come on board, boys?" he asked.
"No, sir; we will go back by the lighter."
"Then good-by, and God bless you and bring you good luck."
Harry could not help feeling sober as he bade farewell to his good friend, the professor.
"I have only you now, Jack," he said. "I don't know what lies before us, but we must stick fast to each other in sunshine and in storm."
Jack's only answer was to seize Harry's hand and press it warmly. Nothing more was needed.