He was Secretary of State for the Colonies (1858) at the beginning of his father’s second administration. Full Wikipedia article.

1.iii.58, 13.iii.58, 23.viii.58, 31.viii.58, 5.ix.58, 6.ix.58, 8.ix.58, 9.ix.58, 12.ix.58, 31.x.58, 18.xi.58, 25.xi.59, 5.xii.59, 14.i.60, 10.vii.60.