The governing idea of this early morning course, which at the present as at former Summer Meetings is devoted to a subject connected with religious belief, is this year the power that Christianity has, or is fitted to have, to unite Christian denominations with one another, and also to unite races and nations, and different portions of that commonwealth of nations which we call the British Empire, and different classes within our own nation. A moment's reflection will shew that the question of unity between denominations of Christians derives special significance from being placed in connexion with all those other cases in regard to which the promotion of unity is to be considered. If it belongs to the genius of Christianity to be a uniting power, it is above all in the sphere of professed and organised Christianity, where Christians are grouped together as Christians, that its influence in producing union should be shewn. If it fails in this here, what hope, it may well be asked, can there be that it should be effective, when its principles and motives cannot be applied with the same directness and force? In the very assumption, then, which underlies this whole course of lectures, that Christianity can unite men, we have a special reason for considering our relations to one another as members of Christian bodies, with regard to this matter of unity.