You all know what a clock is, and how it strikes every hour. One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve. It then begins one again, and so goes on, and has no end. In the middle of the day it strikes twelve, and in the middle of the night also. When it strikes five in summer mornings, then you must rise. When it strikes seven in winter mornings, then you must rise; at eight, eat breakfast; dine at two; and sup at five; go to bed at eight; sleep whilst the clock ticks all night, and wake in the morning to hear it strike again.