Many thanks for this most valuable and informative addition to the site. It is great to see this info on Robert McMurdo, and it helps understand the background of the tense conference in in 1908 that led to the "two lines" of assemblies, Gospel Halls vs. Chapels.
Re Orillia see http://truthandtidings.com/2001/02/our-heritage-a-brief-history-of-assembly-testimony-in-orillia-1881-2001/ --this mentions the division locally, but not its widening spread.