The Dice and the Dice Box.--A dice box and two dice are held in the hand, and the question is to throw one die into the air and catch it in the box. This is not difficult, but the difficulty is to cause the second to enter, for if this be thrown into the air, the first, which is already in the box, will fly into the air likewise and fall outside. In order to make the second enter while the first is already in the box, it must not be thrown into the air, but the hand and the box must be quickly lowered in freeing it, so that the first die, which is in the box, shall be at a less height than the second, which is in the fingers. The dice fall less quickly than the hand and the box. * * * * * THE SCIENTIFIC AMERICAN SUPPLEMENT. PUBLISHED WEEKLY. TERMS OF SUBSCRIPTION, $5 A YEAR. Sent by mail, postage prepaid, to subscribers in any part of the United States or Canada. Six dollars a year, sent, prepaid, to any foreign country. All the back numbers of THE SUPPLEMENT, from the commencement, January 1, 1876, can be had. Price, 10 cents each. All the back volumes of THE SUPPLEMENT can likewise be supplied. Two volumes are issued yearly. Price of each volume, $2.50 stitched in paper, or $3.50 bound in stiff covers. COMBINED RATES.--One copy of SCIENTIFIC AMERICAN and one copy of SCIENTIFIC AMERICAN SUPPLEMENT, one year, postpaid, $7.00. A liberal discount to booksellers, news agents, and canvassers. MUNN & CO., PUBLISHERS, 361 BROADWAY, NEW YORK, N.Y.. * * * * * BUILDING EDITION OF THE SCIENTIFIC AMERICAN. Those who contemplate building should not fail to subscribe. ONLY $2.50 A YEAR. Each number contains elevations and plans of a variety of country houses; also a handsome COLORED PLATE. MUNN & CO., 361 BROADWAY, NEW YORK. * * * * * CATALOGUES A Catalogue of Valuable Papers contained in SCIENTIFIC AMERICAN SUPPLEMENT during the past ten years, sent _free of charge_ to any address; also, a comprehensive catalogue of useful books by different authors, on more than fifty different subjects, has recently been published for free circulation, at the office of this paper. Subjects classified with names of authors. Persons desiring a copy have only to ask for it, and it will be mailed to them. Address MUNN & CO., 301 BROADWAY, NEW YORK. * * * * * PATENTS! MESSRS. MUNN & CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements, and to act as Solicitors of Patents for Inventors.