CHAPTER XXI. A SEPARATION. Tue spring, with its wealth of flowers, its singing-birds, and dancing rivulets, came again to cheer earth’s inhabitants. Again the river Ousa was wide and free. Tom and Bessie went frequently to the island, where some nice chemical apparatus was now placed in the white cottage. All the summer long the island was the resort of Tom, Howard, and Bessie, when they could be spared from other occupations. Mr. Starr, too, was frequently added to the party. He aided Tom in his chemical experiments ; taught Howard to draw from nature; and occasionally gave Bessie a lesson in singing, or, rather, sang with her, or accompanied her