who pointed out the paths to the discovery of scientific truths, and the other a Tuscan, who afforded the happiest experimental illustrations of the speculative views of his brother in science.  You will see academies formed a century later in Italy, France, and Britain, in which the sciences are enlarged by new and varied experiments, and the true system of the universe developed by an illustrious Englishman taught and explained.  The practical results of the progress of physics, chemistry, and mechanics, are of the most marvellous kind, and to make them all distinct would require a comparison of ancient and modern states:  ships that were moved by human labour in the ancient world are transported by the winds; and a piece of steel, touched by the magnet, points to the mariner his unerring course from the old to the new world; and by the exertions of one man of genius, aided by the resources of chemistry, a power, which by the old philosophers could hardly have been imagined, has been generated and applied to almost all the machinery of active life; the steam-engine performs not only the labour of horses, but of man, by combinations which appear almost possessed of intelligence; waggons are moved by it, constructions made, vessels caused to perform voyages in opposition to wind and tide, and a power placed in human hands which seems almost unlimited.  To these novel and still extending improvements may be added others, whish, though of a secondary kind, yet materially affect the comforts of life, the collecting from fossil materials the elements of combustion, and applying them so as to illuminate, by a single operation, houses, streets, and even cities.  If you look to the results of chemical arts you will find new substances of the most extraordinary nature applied to various novel purposes; you will find a few experiments in electricity leading to the marvellous result of disarming the thunder-cloud of its terrors, and you will see new instruments created by human ingenuity, possessing the same powers as the electrical organs of living animals.  To whatever part of the vision of modern times you cast your eyes you will find marks of superiority and improvement, and I wish to impress upon you the conviction that the results of intellectual labour or of scientific genius are permanent and incapable of being lost.  Monarchs change their plans, governments their objects, a fleet or an army effect their purpose and then pass away; but a piece of steel toached by the magnet preserves its character for ever, and secures to man the dominion of the trackless ocean.  A new period of society may send armies from the shores of the Baltic to those of the Euxine, and the empire of the followers of Mahomet may be broken in pieces by a northern people, and the dominion of the Britons in Asia may share the fate of that of Tamerlane or Zengiskhan; but the steam-boat which ascends the Delaware or the St. Lawrence will be continued to be used, and will carry the civilisation of an improved