-The range of the thermometer since ibïó cas been kept at Fort McHenry. Beforo that the coldest years were in 1831, 1836, 1840, and 1841. From 1843 nntil 1852 the thernioiueter continued above zero ; in 1852 the record is flve, in 18ÓG two to four, and in 18ö" six degrees below. Going back to 1780, Griffith tells us of the icobound Patuxent, Potouiac and Chesapeake. In 1824 thnre was a year iuuch like the present, the range of the thermometer having been from ninety-eight degrees, as the greatest heat of the suramor, down to ten degreps below zero, as the coldest of tho winter.