IT WAS SAID THAT Mahomet had banned bells in the masjid , not because they were, in and of themselves, repugnant to Allah, but simply because the Franks were so fond of them, and used them so much, that merely to hear one tolling was to be put forcibly in mind of the profanities of the infidels. If that were true, why a devout Mussulman with the misfortune to be encamped on the fields north of Clerkenwell would have suffered the rudest of all possible awakenings on this Friday: the damp, dark, chill, sewage-scented fog that served, hereabouts, in stead of an atmosphere, was alive with the sounds of church-bells. And none of your merry pealing carillons ringing diverse changes, but the slow stomach-walloping bongs of great solitary bells, gravid with doom.