The air is one vast library on whose pages is forever written all that man has ever said or even whispered. There, in their mutable, but unerring characters, mixed with the earliest, as well as the latest signs of mortality, stand forever recorded, vows unredeemed, promises unfulfilled; perpetuating, in the movements of each particle, all in unison, the testimony of man's changeful will. God reads that book, though we cannot.