[Footnote 3: Professor Autenrieth of Tubingen.]
It is not improbable that some of these splendid visions of science may never be realized: but then other discoveries and improvements may take place of equal and greater importance; and should those hopes be verified, would they exhibit a greater triumph of art than has been witnessed in our day? they are certainly not more beyond the bounds of seeming probability than balloons, and diving bells, and rail roads, would have appeared to a former age.
The most extravagant fancy in which the man of science has indulged would scarcely exceed the wonders now wrought by steam, whether we consider the simplicity of the means, or the magnitude of the results. When in every vessel of heated water mankind had always seen a vapor arise, who could have supposed that in this simple fact, nature had furnished an agent, which by skilfully managing, he could multiply his natural strength a thousand fold, and move from place to place with the swiftness of a bird? By the alternate production and condensation of this vapor, which he is able to do by the very common agents of fire and water, he is able to extract the ponderous minerals from the bowels of the earth, having made it previously drain off the water which put them out of his reach. By the same power he fashions the metal he has made, into bars, or sheets, or rods, according to his various purposes. By it he performs all those operations which require incessant action as well as preterhuman strength; and thus it is made to spin and weave, to saw and bore and plane. By this he grinds his flour, cuts and polishes marble, prints newspapers, and transfers both himself and his commodities from place to place, by land or by water, with a rapidity which had existed only in the creations of an eastern imagination; and what is no less admirable, with a diminution of fatigue equal to the increase of speed.
The kindred sciences of geology and mineralogy have undergone the same improvements as that of chemistry. And by a course of inductive reasoning, founded on careful observation, the changes which the outer crust of our earth, to the small comparative extent that we are able to penetrate it, have been most satisfactorily shown, and referred to their several chemical or mechanical agents. It has also afforded data from which important facts in the history of organized beings have been deduced, and thus it has shed a light on a branch of knowledge from which it seemed most remote. The notion which once prevailed, that no species of animals is extinct, has been incontestibly disproved; and it has shown not only that there were many species which not only do not now exist, but which could not subsist in the present state of the world. Where important facts have not been discovered by human reason, we see its power exerted in profiting by those which accident has suggested; as in Galvani's discovery and that of Haüy in crystallography, of vaccination and many others.