Produced by D Alexander, Andrew Wainwright and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.) ROLLO'S EXPERIMENTS. BY THE AUTHOR OF ROLLO LEARNING TO TALK, TO READ, AT WORK, AT PLAY, AT SCHOOL, AT VACATION, &c. BOSTON: WEEKS, JORDAN, AND COMPANY Entered according to Act of Congress, in the year 1839, By T. H. CARTER, In the Clerk's Office of the District Court of Massachusetts. STEREOTYPED AT THE BOSTON TYPE AND STEREOTYPE FOUNDRY. [Illustration] CONTENTS. Page. JONAS AN ASTRONOMER 11 PRUNING 23 THE GREAT BEETLE AND WEDGE 35 THE LITTLE BEETLE AND WEDGE 46 SPLITTING 59 HOROLOGY 80 JONAS'S DIAL 94 THE BEE-HIVE 112 JONAS'S MAGNET 124 MAGNETISM 139 INTELLECTUAL PHILOSOPHY 157 OSCILLATIONS 165 ROLLO'S EXPERIMENTS. JONAS AN ASTRONOMER. One day, when Rollo was about seven years old, he was sitting upon the steps of the door, and he heard a noise in the street, as of some sort of carriage approaching. A moment afterwards, a carryall came in sight. It drove up to the front gate, and stopped. Rollo's father and mother and his little brother Nathan got out. His father fastened the horse to the post, and came in. When Rollo first heard the noise of the carryall, he was sitting still upon the steps of the door, thinking. He was thinking of something that Jonas, his father's hired boy, had told him about the sun's shining in at the barn door. There was a very large double door to Rollo's father's barn, and as this door opened towards the south, the sun used to shine in very warm, upon the barn floor, in the middle of the day. Rollo and Jonas had been sitting there husking some corn,--for it was in the fall of the year;--and as it was rather a cool autumnal day, Rollo said it was lucky that the sun shone in, for it kept them warm. "Yes," said Jonas; "and what is remarkable, it always shines in farther in the winter than it does in the summer." "Does it?" said Rollo. "Yes," said Jonas. "And what is the reason?" asked Rollo.