SPEED.
One who has made a study of the subject states that the average rates of speed attained by certain travelling things, are as follows: A man walks three miles an hour; a horse trots seven; steamboats run eighteen; sailing vessels make ten; slow rivers flow four; rapid rivers flow seven; storms move thirty-six; hurricanes, eighty; a rifle ball, one thousand miles a minute; sound, eleven hundred and forty-three; light, one hundred and ninety thousand; electricity, two hundred and eighty thousand.