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Show Raps on Wood. 4 The custom of rapping on wood Is said' to have had a religious origin. Three knocks signified an appeal to each of the three 'persons of the Trinity Trin-ity and the substance rapped' on wa9 wood, because Christ was crucified on a cross of wood. Undoubtedly a number num-ber of persons resort to this practice just as a kind of joke. To others it represents . a pretty vital precaution against being overtaken by an ill from which they have declared themselves free thus far. |