A slow, painful progress, through three centuries, science crept on from point to point, with many mistakes and many failures, a progress often marked and flecked with the stains of human effort, but all the same the most revolutionary and far-reaching advance ever made by man's intellect. We are too close to the events to appreciate fully the changes which it has wrought in man's relation to the world; and the marvellous thing is that the most important of these changes have been effected within the memory of those living. Three stand out as of the first importance. My generation was brought up in the belief that "Man was in his original state a very noble and exalted creature, being placed as the head and lord of this world, having all the creatures in subjection to him. The powers and operations of his mind were extensive, capacious and perfect"--to quote the words of one of my old Sunday-school lessons. It is not too much to say that Charles Darwin has so turned man right-about-face that, no longer looking back with regret upon a Paradise Lost, he feels already within the gates of a Paradise Regained. Secondly, Chemistry and Physics have at last given him control of the four elements, and he has harnessed the forces of Nature. As usual Kipling touches the very heart of the matter in his poem on "The Four Angels," who in succession offered to Adam fire, air, earth and water. Happy in the garden, watching the apple tree in bud, in leaf, in blossom and in fruit, he had no use for them; but when the apple tree was cut down, and he had to work outside of Eden wall,--then-- out of black disaster He arose to be the master Of Earth and Water, Air and Fire. And this mastery, won in our day, has made the man with the hoe look up. But the third and greatest glory is that the leaves of the tree of science have availed for the healing of the nations. Measure as we may the progress of the world--intellectually in the growth and spread of education, materially in the application to life of all mechanical appliances, and morally in a higher standard of ethics between nation and nation, and between individuals, there is no one measure which can compare with the decrease of disease and suffering in man, woman and child. The Psalmist will have it that no man may redeem his brother, but this redemption of his body has been bought at a price of the lives of those who have sought out Nature's processes by study and experiment. Silent workers, often unknown and neglected by their generation, these men have kept alive the fires on the altars of science, and have so opened the doors of knowledge that we now know the laws of health and disease. Time will only permit me to refer to a few of the more important of the measures of man's physical redemption.