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80 of his ideas respecting that science, and she had insisted upon his getting a popular primer, with diagrams, and mastering it as a preliminary to deeper study.

One evening he was in the smaller room of the two that, divided by an arch, served for study and drawing-room combined; and he was busily engaged in working out a simple practical illustration, by the aid of one of the aforesaid diagrams. The experiment required a lamp, a ball of cotton, and an orange transfixed by a knitting-needle, and it had something to do with the succession of the seasons, solar and lunar eclipses, and the varying lengths of day and night on different portions of our globe, though he was not very clear what.

"Don't you find you understand the inclination of the moon's orbit to the plane of the ecliptic better now?" said Sophia, as she came through the arch.

"I think I shall, as soon as I can get the moon to keep steadier," he said, with more hope than he felt; "and it's rather hard to remember whereabouts I am supposed to be on this orange."

"I must get you something to make that