He was convener of the committee which issued the Free Church hymn book, and he threw into this work the same energy and catholicity of mind which marked the rest of his activities.
For three years before his death he was convener of the church interests committee of the Church of Scotland, which had to deal with a great agitation for disestablishment.
Isolated examples in the early middle ages of metropolitans dealing with their suffragan bishops by imprisonment in chains were extra-canonical abuses, connected with the perversion of Church law which treated the metropolitan (who originally was merely convener of the provincial synod and its representative during the intervals of sessions) as the feudal " lord " of his comprovincials.
The town council, which has its headquarters in the Municipal Buildings in the Royal Exchange, consists of fifty members, a lord provost, seven baffles, a dean of guild, a treasurer, a convener of trades, seven judges of police, and thirty-two councillors.
In 1864 Duff visited South Africa, and on his return became convener of the foreign missions committee of the Free Church.