James MacGregor, an Antiburgher
Seceder missionary from Scotland, who in 1788 published a pamphlet against another Presbyterian minister in Nova Scotia who held slaves, began the abolitionist movement in Canada.
He was suspended and excommunicated as a teacher of Antiburgher
divinity students at Abernethy in 1763 for recommending in their philosophy classes Lord Kames, Essays on the principles of morality and natural religion (Edinburgh, 1751).
This society had a strong Congregationalist interest, but it also supported missionaries from the Relief Church and the Antiburghers