Likewise I never discovered when Robert G Sommerville died. I note he becane Provost of Glasgow in 1877.
There isnt a Robert G Sommerville listed as being the (Lord) Provost of Glasgow
He was however Provost of Port Glasgow
KELLY (Glasgow), DUNLOP (Ireland, Glasgow), PATERSON (Coatbridge), PATTERSON (Midlothian, Berwickshire), YOUNG (Eastwood), MUIR (Kilmarnock) CAMERON (Stirlingshire, Glasgow, Angus)