Professor Sully, in au artiol ia The Popular Science Monthly, comnaeniing on the jealons regard for oeremony aud the proprieties of behavior as seen ia the enforoement of rules of politenew by ohildren, cites a delightfnl inttasc that feil under his own obseryation as he was walking on Bampstead heath. "It was a spring day, aud the fat buds of the cheetmit were bursting into magnificent green plnmes. Two well dresed 'misaes, ' aged, I shonld eay, about 9 and 11, -svere taking their torrect morning-walk. The eider called the attention of the yonnger to one of the trees, pointiug to it. The younger exclairued in a highly shocked tone, 'Oh, Maud, yon know you shouldn't polntl' The notion of perpetrating a rudeness on the chestnnt tree was funny enough. Bot the incident is instructiva as illustrating the childish tendency to stretch and generalize rules to the utmost. "