Research Request: So when did General Convention “effect” the division of 1873?

http://www.standfirminfaith.com/index.php/site/article/7895/

[Stand Firm] 26.11.07--The Episcopal church presented a number of witnesses in the Virginia parish property trial, including David Booth Beers, the Presiding Bishop's chancellor, Ian Douglas, a professor at the Episcopal Divinity School, and Robert B. Mullin, a professor at General Theological Seminary.

According to The Living Church, David Booth Beers, the Presiding Bishop's chancellor testified repeatedly "that under The Episcopal Church's constitution and canons only General Convention can effect a division."