"Well, when the trees are grown, you have the walnuts, and when the trees get older black walnut timber, which is very valuable. A hill such as Round Top that isn't much good for anything else, would raise good black walnut timber. Of course, you'd have to dynamite the holes good and deep where you put the trees, so they'd have no trouble getting good roots. Once they were well started, I don't think there'd be any trouble with them."
"I hadn't thought of that, Bob," said his uncle, "but I guess we had better look into it. By the time the peach trees were dead, the walnut trees would have a good start. How many trees will it take to plant it?"
"I figure if we took the whole twelve acres, it would require twelve hundred peach trees," said Bob.
"But that would be a good many peach trees to take care of, Uncle
Joe."
"Yes, but we won't be building any concrete buildings by the time they begin bearing, so why not plant it all in peach trees with the black walnuts in between, as you say?"
"I'll have Edith write to a grower to-night, if you wish, Joe, and find what the peaches will cost," said his wife.
"How about the black walnuts?" asked Bob. "Shall we plant the trees or nuts?"
"I think we had better plant nuts and let them grow themselves. We can stick a lot of them between the peach trees and, of course, the peach trees will be dead long before the walnuts get to be any size."
Much to the regret of every one, two days later Ruth and Edith said good-by to Brookside Farm and went back to their New England homes. They had intended to stay a few weeks longer, but a telegram from Edith's father saying her mother had been taken suddenly ill and needed her, caused them to decide that they should return at once. When Bob came back from an inspection trip with John White and the County Commissioners over the new concrete road, they had packed their trunks and were ready to leave for the afternoon train. He drove the girls and their Aunt Bettie to town in the car and was particularly depressed when he said good-by at the station—somehow or other they had become part of the life at Brookside Farm, and now that they were going he began to realize how much he would miss them. Even the good- natured Ruth, in her impetuous way and ability to get into trouble, had added much to the life on the farm. Edith was very quiet all the way to the station, and Bob could not tell whether it was worrying over the possible illness of her mother or her disappointment in having to return so soon, or maybe, as he hoped, it was for another reason she was silent—at any rate, she had little to say to him as he bid her good-by, but just before she ascended the steps of the train, when, for a second, they looked full into each others' eyes, he seemed to feel that perhaps he was right in attributing it to that reason.
So the girls went on their way and Bob went back to work.