"General Instructions for the Direction of Postal Inspectors in the Dominion of Canada" is an important document written by Alexander Campbell that set out the rules and procedures for postal inspectors in Canada in the late 19th century. This book describes in detail the requirements for conducting official operations, monitoring the performance of postal services, reporting and other aspects of inspectors' work. The author provided inspectors with the necessary instructions on effective control of post offices and verification of compliance with legislation. This book served as an important source of information for postal workers and helped maintain order and efficiency in the postal service system in Canada. The material provided in the "General Instructions for the Direction of Postal Inspectors in the Dominion of Canada" is a useful resource for studying the history of the Canadian postal system and the postal service in general."