Wehman Bros.' new book of one hundred and fifty parlor tricks and games : home-made apparatus . Origin of Dominoes* Two Italian monks, committed to a lengthy seclusion,beguiled the weary hours of their confinement, it is said, byshowing each other small flat stones marked with black a preconcerted arrangement the winner would inform th-eother player of his victory by repeating in an undertone thefirst line of the vespers prayer. In process of time the twomonks managed to complete the set of stones and to perfectthe rules of the gartie, so that when the term of incarcerationhad expired


Wehman Bros.' new book of one hundred and fifty parlor tricks and games : home-made apparatus . Origin of Dominoes* Two Italian monks, committed to a lengthy seclusion,beguiled the weary hours of their confinement, it is said, byshowing each other small flat stones marked with black a preconcerted arrangement the winner would inform th-eother player of his victory by repeating in an undertone thefirst line of the vespers prayer. In process of time the twomonks managed to complete the set of stones and to perfectthe rules of the gartie, so that when the term of incarcerationhad expired the game was so interesting that it was generallyadopted by the inmates of the monastery as a lawful soon spread from town to town, and became popularthroughout Italy; and the first line of vespers was reducedto the single word Domino, by which the game has eversince been known. 42 TRIOKS The Magic Glass. It is a square piece of glass perfectly plain, on which nodrawing or any lines can be distinguished even after minuteinvestigation. But if any one breathes on the surface of the. glass, a figure such as that shown in the engraving figure will disappear immediately the breath has evapor-ated from the glass. You may wash and rub the glass, but theimage will again appear if the plate be breathed upon. Theexplanation is simple. Obtain a square piece of glass, any sizeyou choose, and draw upon it any design you choose with somefluor-hydric acid, which is obtained by dissolving somepowdered fluorspar in the ordinary sulphuric acid of com-merce. When it is sufficiently liquefied the figure should betraced on the glass with a quill pen. Leave it for a few min-utes—five to ten at the most. Wash the glass and dry it TRIOKS 43 well. Then when it is breathed upon the figure or designwill appear. A little experience will decide the length of time requisitefor the proper production of the figure; the acid if left toolong will eat into the glass, and the design will


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