Lord Palmerston resigns after defeat on Conspiracy to Murder bill following Orsini plot and Lord Derby forms Conservative administration.
Editors. "The Earl of Derby becomes Prime Minister for the second time". The Literary Encyclopedia. First published 01 January 2010; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=1856, accessed 27 April 2015.]