Jan. 24 (UPI) -- On this date in history: In 1848, gold was discovered at John Sutter's mill near Sacramento. The discovery touched off the great gold rush of 1849. Advertisement In 1908, the first Boy Scout troop was organized in England by Robert Baden-Powell, a general in the British army. In 1916, the U.S. Supreme Court ruled that an income tax was constitutional. In 1939, 20 divisions of General Francisco Franco's Fascist armies smashed through the Llobregat River defense line west of