The subject of rotatory motion continued--A ball, by having a peculiar spinning motion imparted to it, may be made to stop short, or to retrograde, though it meets not with any apparent obstacle--The rectilinear path of a spherical body influenced by its rotatory motion--Bilboquet, or cup and ball--The joint forces which enable the balancer to throw up and catch his balls on the full gallop--The hoop--The centre of percussion--The whip and peg-top--Historical notices--The power by which the top is enabled to sustain its vertical position during the act of spinning--The sleeping of the top explained--The force which enables it to rise from an oblique into a vertical position--Its gyration CHAPTER IX.   Page 151 Trap and ball--Gifts from the Vicar--An antiquarian history of the ball--The see-saw--The mechanical powers--The swing--The doctrine of oscillation--Galileo’s discovery--The pendulum--An interesting letter--Mr. Seymour and the Vicar visit Major Snapwell CHAPTER X.   Page 167 Marbles--Antiquity of the game--Method of manufacturing them--Ring-taw--Mr. Seymour, the Vicar, and Tom, enter the lists--The defeat of the two former combatants; the triumph of the latter--A philosophical explanation of the several movements--The subject of reflected motion illustrated--The Vicar’s apology, of which many grave personages will approve CHAPTER XI.   Page 180 Mr. Seymour and his family visit the Major at Osterley Park--A controversy between the Vicar and the Major--The Sucker--Cohesive attraction--Pressure of the atmosphere--Meaning of the term suction--Certain animals attach themselves to rocks by a contrivance analogous to the sucker--The Limpet--The Walrus--Locomotive organs of the house-fly--A terrible accident--A scene in the village, in which Dr. Doseall figures as a principal performer--The Vicar’s sensible remonstrance--The density of the atmosphere at different altitudes--Inelasticity of water--Bottle-imps--The Barometer--The pop-gun--The air-gun--An antiquarian discussion, in which the Vicar and Major Snapwell greatly distinguish themselves CHAPTER XII.   Page 202 The soap-bubble--The squirt--The bellows; an explanation of their several parts--By whom the instrument was invented--The sucking and lifting, or common pump CHAPTER XIII.   Page 215