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. One of the collections he continued to work on right up to his death in 2002 was ‘Early Express Company Operations in Ontario and Quebec, Competing with the Post Office Department’. Early Express Mail was a field that intrigued Horace, and became a major passion in his last fifteen years. Unlike the British Columbia express companies, the eastern carriers had not been systematically studied, and no truly comprehensive collection had been developed. Horace went about both the research and the acquisition relentlessly, and very little passed him by. The results speak for themselves, and present an opportunity for interested collectors that simply will not come again.In the end, it is the research and writing, the information shared, and the material assembled, that define the collector. This volume 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.’Express Company Operations in Ontario and Quebec, Competing with the Post Office Department’ has been printed, as have been all Exhibit Series books produced since October 2002, from computer scanned originals instead of from the black and white photocopies used to produce the 1997 version of this exhibit. 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.