Horace Harrison was one of the preeminent philatelists in the field of British North America. Over more than 50 years he collected and researched many specialties, writing and exhibiting as his material and knowledge grew. ‘Canadian Money-Letters Forerunners of Registered Mail’, a necessary companion to the three previously released Harrison Registered mail exhibit books, includes strikes of all known money letter and money handstamps, as well as rare examples of divided payment money letters (paid in part by the sender and in part by the addressee). It also includes very rare examples of money letters to the United Kingdom and an interesting selection of money letters to the United States. Changes in rates (domestic and to the U.S.) are well represented, and a wonderful range of town and rate markings can be found. There is a truly unique cross-over cover, mailed on the last day of the money letter system, delivered on the first day of the registered mail system, which shows both a money letter and a registered handstamp.In the end it is the research and writing, the information shared, and the material assembled, that define the collector. This volume too stands as a true testimonial to Horace’s philatelic stature. It is comprehensive, and it is definitive. He had fun getting every piece, and was very pleased to know that others would be able to continue the study.’Canadian Money-Letters Forerunners of Registered Mail’ has been printed, as have been all Exhibit Series books produced since October 2002, from computer scanned originals. Digital scanning provides better defined images and allows the exhibits to be reproduced in colour or black and white. It also ensures that a lasting copy of the original is on file for later use in a variety of formats.