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was generated by this tremendous process of building up a universe go to? To the unoccupied chambers of space they say. Very well, but if it is gone for ever from the material universe and the energy operative on earth has never and at no time been the same, then how can they try to maintain the "unchangeable quantity of energy," that potential energy which a body may sometimes exert, the FORCE which passes from one body to another producing motion and which is not yet "annihilated or changed into anything else." Aye, we are answered, "but we still hold to its indestructibility; while it remains connected with matter, it can never cease to be, or less or more."