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Show Rapping on Wond Tlie origin of the suik-rstitim concerning knocking on wood doubtful. Some aiithoritu's uttri')-ute uttri')-ute it to the undent religious riu-of riu-of touching a crucifix when takirj; an oath; others to the touching of beads of the rosary when praying Among the Ignorant peasants o'f Europe the custom prohahly began with the habit of knocking loudly to keep evil spirits nway. Cauie of Leaves Turning ReJ Two general classes of chemical '"nipnunils re responsible fnr leaves turning yellow or red. The rarotinohls cause the yellows and the nnthocyanins the reds and pur Pies. Maples, which sometimes show a mottling of yellows and reds may have local patches of nnthocyanins nntho-cyanins masking out the cartinold ground color. |