This work investigates the operational mechanics and social significance of the postal service as a vital infrastructure for professional and personal communication. George Archibald Campbell examines the historical development of mail delivery systems, focusing on the labor force required to maintain these networks and the impact of written correspondence on the daily lives of men and women in the workforce. The text provides a detailed account of the logistical challenges inherent in early postal systems and the evolving role of the post office in a modernizing society.

Historians and researchers of labor history often cite this text for its detailed documentation of early twentieth-century administrative practices. The prose is noted for its straightforward, descriptive approach to the technical aspects of postal operations.