Lord Palmerston resigns after defeat on Conspiracy to Murder bill following Orsini plot and Lord Derby forms Conservative administration.
Citation:
Editors. "The Earl of Derby becomes Prime Minister for the second time".
The Literary Encyclopedia. First published 01 January 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=1856, accessed 25 May 2013.]