Here is a trick played with dominoes which may be new: Spread out a set of dominoes upon the table, being careful to extract one for your own use. Inform the company that if they will match the dominoes you have laid down, using every domino, you will, after leaving the room, determine the numbers at either end of the match. You then leave the room, and read the numbers on your stolen domino. This will almost infallibly prove to be the end numbers of the match. When the match has been formed and concealed by a handkerchief, you enter the room and announce the end numbers.

Vincent V. M. Beede.

This Department is conducted in the interest of stamp and coin collectors, and the Editor will be pleased to answer any question on these subjects so far as possible. Correspondents should address Editor Stamp Department.

Have you noticed that U. S. stamps are now printed on water-marked paper? The water-mark can be seen quite plainly in the blank margin, but is very indistinct in the stamps themselves. It consists of the letters U S P S in double line capitals 16 mm. high repeated, and the probable intention was to have one of the letters on each stamp. But if so the work has been carelessly done by the paper-makers, as there are only ninety letters to the one hundred stamps, together with the two blank margins on the two sides of each sheet. The arrangement is as follows:

PSUSPSUSP
SUSPSUSPS
USPSUSPSU
SPSUSPSUS
PSUSPSUSP
SUSPSUSPS
USPSUSPSU
SPSUSPSUS
PSUSPSUSP
SUSPSUSPS

Only nine letters horizontally, to each of the ten lines. It is to be hoped that the Postmaster-General will have the paper made in such a way that each and every stamp will have the same water-mark. Why not use the letters U. S. on each stamp? They could be made 4 or 5 mm. high, and be plainly seen. The New South Wales stamps, for instance, are marked "N. S. W.," with a crown above. So far as I have seen, the present water-mark appears on the following stamps: 1c. blue; 2c. red, on all three types of the triangle; 8c. purple, and 10c. dark green.

A. Cort.—The dealers sell quarters of 1819 at 75c., dimes of 1838-39 at 20c. each. Age has nothing to do with the value of a coin. You can buy some coins 2000 years old and over at 25c. each at the dealers.