"A Hundred Years by Post: A Jubilee Retrospect" by James Wilson Hyde gives some particulars of the changes that have taken place in the Post Office service during the time between the late-1700s and the late-1800s. The book was written not just because it was thought to prove interesting, but also to showcase the influence and usefulness the Postal Service must necessarily have upon almost every relation of political, educational, social, and commercial life.