[1] He was born at Newington, Surrey, the fourth son of Edward Treslove, and was educated at Tonbridge School.
He was shortly moved to Kent, where he made his home at Mark Field House, Tonbridge.
[3][4][5] In The Institutions of the English Government (1863), Cox argued in terms of a constitutional "balance of powers", at variance with the contemporary theorists Walter Bagehot and A. V.
[6] A History of the Reform Bills of 1866 and 1867 was acknowledged by the author as a partisan Liberal work.
[7] He was a critic of the cross-party co-operation seen in passing the Reform Bill of 1867, arguing that democracy was being undermined.