The Duke of Wellington's funeral, 1852.--The siege of Paris, 1870.--Mafeking, 1899.--Lord Kelvin and a piece of radium, 1900.--Opening Tutankhamen's tomb, 1924.--The declaration of war, Aug. 4, 1914.--The Reichstag fire, 1933.--Chamberlain's last visit, Munich, 1938.