R. CRAIG.--The current 50c. U.S. cancelled is worth 10c. The old bank bill has no value. E. C. WOOD, Germantown, Pa., K. C. GIBSON, Morrisburg, Ont., wish to exchange U. S. and Canada stamps. W. C. A.--The rarest U.S. cents are 1793, Liberty Cap, $7.50; 1799 over 98, $7.50; 1799, perfect date, $10. C. F. PHILIP.--Values of sets of U.S. Departments in unused "mint" condition, are, State, $287; Executive, $49; Navy, $40; Agriculture, $27.65; Treasury, $12; War, $4.50; Post-office, $4.50; Justice, $110; Interior, $4.50. Used sets are not worth as much, and damaged sets are materially less in value. The loss of a single perforation, or uneven centering, will affect some of the stamps from ten per cent. to thirty per cent. in value. J. H. BROWN.--There are two varieties of the 1860 silver 5c. piece. The one bearing the figure of Liberty with "United States of America" around it is common. The one with Liberty surrounded by stars in place of "United States of America" is rare. Dealers charge $5 for a good copy of the rare stamp, 10c. for the common one. J. S. POPPER.--I do not know what album you have, nor can I say whether your stamp is genuine or counterfeit, as I have not seen it. The New York 5c. black, Washington's portrait, has a space in all the standard albums, at the beginning of the U.S. issues. The Saxony 10 gr. blue is worth $4. The Roman stamps are catalogued at 5c. each. J. HALL.--The 24c. U.S. 1851, unperforated, is a very rare stamp. An unsevered pair would be worth from $250 to $500. A single stamp is worth $100. Unprincipled parties have taken copies of the 1856 perforated stamp with wide margins, and trimmed off the perforations, then offering the same as unperforated. N. C. WILBUR.--Your coin is a Columbian quarter made by the U.S. government, and is a legal tender for face value. It is getting a little scarce, and dealers now ask $1.25 for it. PHILATUS. ADVERTISEMENTS. HOW MANY different advertisements of COLUMBIA BICYCLES HAVE YOU SEEN? [Illustration] The variety of Columbia Bicycle advertising is great. All the good points of Columbias, all the delight of riding them, cannot be fully described in any one advertisement, nor in a hundred. We wish to know how many announcements can reach any one person, and so offer a COLUMBIA BICYCLE as a PRIZE to whoever shall send us the greatest number of _different_ Columbia Bicycle advertisements clipped from newspapers or magazines issued since Jan. 1, 1896. Many advertisements differ only in a word or two; others in the style of type; distinct variations only, however, will be counted. Each advertisement must have plainly attached to it the name and date of the newspaper or magazine from which it is clipped. Separate entries cannot be combined.