IRREGULARITY IN OUR POSTAL DELIVERY.—One day this week the mail bags which ought to have arrived by the 1.17 train from London, did not reach the Post Office here till after the arrival of the 5.35 p.m. down train. Much disappointment and inconvenience was the consequence, from the long delayed and anxiously awaited ‟postman’s knock.” It is be hoped the cause of the delay may be so sifted and arranged as to prevent a similar occurrence in future.