There remains public worship and community-religion. It is clear that whereas a Church in the Middle Ages was not only Church but also Museum of curiosities, Art-gallery and Theatre, and in large measure also took the place of our press and public libraries, now it is none of these things. There is now less reason for public worship, fewer functions for it to perform. On the other hand a religion is essentially in one aspect social, and not only does the unity of nature demand a unity of religion, but such unity of religion would be of the highest importance as a bond of civilization and a guarantee of the federalist as against the solely nationalist ideal. Moreover, to many types of mind, and to almost all men in certain circumstances, the partaking in a public religious ceremony in common with others is of real importance. It is safe to say, therefore, that these ceremonies will continue, however much modified, and that for them a mediator or priest, even if but temporarily acting as such, will be needed. The problem is largely that of combining in public worship the religious effectiveness of the simple, the hallowed, and the universally familiar--such as inheres in many of the prayers, psalms, and hymns of the Church to-day--with the spontaneity and immediacy which, for instance, are to be found at a devotional meeting of the Society of Friends. In any case, the new intellectual premisses once granted, the limitations imposed on human mind once understood, the important thing is to give a greater vigour and reality to religious experience itself, whether personal and private or social and public. It is just here that Science may help, where knowledge may be power. Atonement, conversion, sense of grace, ecstasy, prayer, sacrifice--the meaning and value of these and of other religious acts and experiences can be put on a proper psychological basis, they can be shorn of excrescences, and their practice take its place in normal spiritual development. That is of the essence of any religion rooted in scientific ideas--that comprehension should make practice easier and better worth while. I am only too painfully aware of the omissions which such a cursory treatment of the subject inevitably involves. I have given you, I know, little but dry bones; but bones are the framework necessary before impatient life can animate a new form. If Science can construct that form, the emotions and hopes and energies of humanity will vivify and clothe it. It is with the aid of such intellectual scaffolding that the common mind of humanity in the future, inevitably rooted in scientific conceptions as it will be, must try to raise that much-desired building, a religion common to all.