ago, that this which we see, the earth, the stars, and all the wonders of the heavens, is one, a universe. Not only that. We have discovered the unity of force. There are not, as primitive man supposed, a thousand different powers in the universe, antagonistic and fighting with each other. We have learned to know that there is just one force in the universe. That light, heat, electricity, magnetism, all these marvellous and diverse varieties of forces, are one force, and can be at the will and skill of man converted into each other. Next, we have learned that there is one law in the universe. Should we not be Unitarians? Should we not believe in the unity of God, when we can see, as far as the telescope can reach on the one hand and the microscope on the other, one eternal, changeless Order? Another point. We have learned the unity of substance. We know how Comte, the famous French scientist, advised his followers not to attempt to find out anything about the fixed stars, because, he said, such knowledge was forever beyond the reach of man. How long had Comte been dead before we discovered the spectroscope? And now we know all about the fixed stars. We know that the stuff we step on in the street this morning as we go home from church is the same stuff of which the sun is made, the same stuff as that which flamed a few years ago as a comet, the same stuff as that which shines in Sirius, in suns so many miles away that it takes millions of years for their light to reach us. One stuff, one substance, throughout the universe; and this poor old, tear-wet earth of ours is a planet shining in the heavens as much as any of them, of the same glorious material of which they are made. Then, again, we have discovered the unity of life. From the little tiny globule of protoplasm up to the brain of Shakspere, one life throbbing and thrilling with the same divinity which is at the heart of the world. We have discovered not only the unity of life, we have discovered the unity of man. Not a hundred different origins, different kinds of creatures, different-natured beings, but one blood to dwell in every country on the face of the earth: the unity of man. We have discovered the unity of ethics, of righteousness, of right and wrong, one right, one wrong. A million applications, but one goal towards which all those who hunger and thirst after righteousness are striving. One religion: for underneath all the diversity of creeds and religions, barbaric, semi-civilized, civilized, enlightened, we find man, the one child of God, hunting for the clearest light he can command, after the one Father, that is, the one eternal, universal search of the religious life of the race. Religion then one; one unifying purpose; every step that the world takes in its progress leading it towards liberty, towards light, towards truth, towards righteousness, towards peace. One goal, then, for the progress of man.