PUTTING ON THE SCREW. The cold on the 8th of February, 186-, was more intense than the Parisians had experienced during the whole of the severe winter which had preceded it, for at twelve o'clock on that day Chevalier's thermometer, so well known by the denizens of Paris, registered three degrees below zero. The sky was overcast and full of threatening signs of snow, while the moisture on the pavement and roads had frozen hard, rendering traffic of all kinds exceedingly hazardous. T...