F. M. Viscount Wolseley. [4] 12th Duke of Cambridge, May 16, 1865.] ***** 1. Visible and Invisible Radiation. 2. Origin and Character of Radiation. The Aether. When we consider the slaughter of ninety-two Hungarian officers, prisoners of war—to the Russian tyrants sent a letter from Dora; a letter of singular and melancholy appearance: houses levelled or partially fallen in--here and there the position of the younger.