JOHN HERBERT DUDLEY RYDER, fifth Earl of Harrowby, died on the 30th of March, 1956, at the age of 91. The Earl of Harrowby had held the office of treasurer of the Institution longer than anyone else in the Institution's history. He was appointed to the post in 1899 and resigned more than 47 years later in October 1946. He was a partner in Coutts & Co., the Institution's bankers.

The Earl of Harrowby was succeeded as treasurer of the Institution by the late Duke of Montrose..