Strange thumping sounds

     Those of you who have followed this journal for some time will remember the thumping sounds that about drove the wife and me bonkers because it was only heard in the library and no place else in the house. Those sounds stopped in July of this year and haven't been heard since. We had had short intervals of quiet before but none that lasted more than a couple of weeks. Its been months now. What ever the cause was; doesn't seem to be with us any longer. The house has been so quiet since Thanksgiving that its been rather boring. Most unusual for this time of year.