Jr. Horatio Alger 
Telegraph Boy [EPUB ebook] 

The class of boys described in the present volume was called into existence only a few years since, but they are already so numerous that one can scarcely ride down town by any conveyance without having one for a fellow-passenger. Most of them reside with their parents and have comfortable homes, but a few, like the hero of this story, are wholly dependent on their own exertions for a livelihood.