The first Moderator of the CPC's General Assembly, Rev. William Ormiston, then of Central C.P.C. in Hamilton, Ontario, sent out letters at the end of his term (he was moving to serve a Dutch Reformed Church in New York City), for these groups to hold a conference of all strands of Presbyterianism in the new Dominion of Canada. This conference was held in Montreal in September 1870, and led these four groups to produce a basis of union, which in June 1874 saw both the Canada Presbyterian Church's General Assembly and Church of Scotland Canada Synod meet in Ottawa, where the proceedings and final preparations and delegations met in the nearby Knox (CPC) and St. Andrew's (Church of Scotland) congregations.