A Curious Calculation

Hero is i curious arlt'hmetical puzzle, the principie of whieh you may Eind it difíicult to discover, but you ■will tiiid that the amswer i.s alwavs correct. Open a book at random, and & a word witliin the iii-st ten limes, and Mithia the tenth word froni the end of the Une, Mark the word. Now doublé the number of tüi-e page and multlply the sum by 5. Tlien add 20. Then add the number of the line you have sclected. Tben add 5. Multiply tin' sum by 10. Add the numlwr of the -word in line. l'roni HiN sum gubtract 250, and the remainder will indicate in the unit column the number of the word; in the 10 column the number of tiie line, and the remalning Figures the number of the page.