small bundle of connected corks was launched in a sluggish current upon a voyage across the Atlantic. The corks drift slowly on from day to day with the same conditions all round them. If the corks were sentient we could imagine that they would consider these conditions to be permanent and assured. But we, with our superior knowledge, know that many things might happen to surprise the corks. They might possibly float up against a ship, or a sleeping whale, or become tangled in seaweed. In any case, their voyage would probably end by their being thrown up on the rocky coast of Labrador. But what could they know of all this while they drifted so gently day by day in what they thought was a limitless and homogeneous ocean?
"Your readers will possibly comprehend that the Atlantic, in this parable, stands for the mighty ocean of ether through which we drift, and that the bunch of corks represents the little and
