The Latest Horror.Scientists have built for advertisers, by an arrangement of mirrors, reflecting glasses and lights, a sort of gigantic magic lantern, by which images can be thrown upon the clouds, so that advertisements in letters 100 feet long will be visible over a dozen counties. On the bosom of an advancing cyclone horrified humanity of the future will be able to read in gigantic letters “yse Blank’s Chest Protector,” “Try Brag-em’s Pills.”—Minneapolis Journal.