9 Passed in 1646.
There is too, a good deal of uncertainty and inconsistency in the statistical accounts of the state. On the duty of the present generation to collect and preserve every thing relative to the revolution, I need not lay any stress. There are still numerous papers in many families, of no sort of value to them, that may yet shed light on that interesting era.
In all that concerns the other object of this Society, the physical history of the state, every thing is yet to be done. The records here are before us, and are indestructible in any reasonable term of time; but we must first labor to remove the rubbish which conceals them, and then study to decipher them. This is a tempting field of research, as it may not only add to our stock of information, but also to our store of worldly wealth. The great Appalachian chain of mountains, which traverses the United States from Maine to Alabama, is broader no where than in Virginia, or consists of a greater number of distinct ridges, and no where has it given as clear indications of abounding in mineral wealth. We have found in it already gold, copper, lead, iron, manganese, gypsum, salt, coal, nitre, alum, marble in great variety, besides other minerals that are useful in the arts; and a more diligent and scientific search than has yet been made, may by increasing their number increase the profit of those canals and roads that are now projected, and give rise to others not yet contemplated. Our demand for fossil coal is of growing importance; for our increasing population at once increases the demand for fuel, and diminishes the supply of wood. I was happy to see last evening, the specimen of anthracite coal from the county of Augusta; and the value of that mineral deserved the high eulogy it received. We may form some idea of the importance of fossil coal, from the fact that steam engines in England are now computed to perform annually, the work of four hundred millions of men! a number nearly double to that now living on the whole globe.
Nor is the geology of the state to be disregarded. Ever since a careful examination of the materials of the earth's surface has been found to afford indications of its past changes, this science has been diligently and successfully cultivated in Europe, and has not been neglected in some parts of the United States. It is high time that Virginia should contribute her quota to its researches. We should be the more stimulated to cultivate this branch of science in the United States, in consequence of the remarkable regularity of the different formations on this continent. Thus along the coast below the falls, we have south of Long Island the tertiary formation; between the falls and the Blue Ridge, the primitive; and the great Mississippi Valley, from the Alleghany to the Rocky Mountains, if principally secondary. There are however, occasional exceptions to these general rules, and they should be noticed with care. As our useful minerals lie near the surface, our observations will, for a long time to come, be principally confined to that; but as there are instances of shafts being sunk in search of salt water or gold, the strata should be carefully noted; and where any pit of unusual depth is sunk, it would be well to make experiments on the heat of the earth, before the admission of the ordinary air has altered its temperature. It has long been asserted that there was an internal heat in the interior of the earth, and further observation seems to confirm it. This fact has lately had a seemingly conclusive verification in England. A shaft had been sunk there in pursuit of coal, to the extraordinary depth of nearly fifteen hundred feet; and by a number of careful experiments, the heat at the bottom was found to be 28° hotter than the average heat of the earth in this latitude, which would seem to show an increase at the rate of a degree of Fahrenheit for every sixty feet.10 Should this correctly indicate the measure of the earth's internal heat, then at the depth of something less than two miles, we should come to the temperature of boiling water. When we recollect that this heat is not farther removed from us than a two thousandth part of the distance to the centre, (bearing about the same proportion to the earth as the parchment stretched over it, does to an ordinary globe,) it seems to afford a ready solution for volcanoes, earthquakes, and many geological phenomena; and may even excite our wonder, that some of these results of so mighty an agent are not more frequent and terrible than they are. And when we recollect that the confines between organized matter, and that form of it which is inconsistent with animal or vegetable life, approach so near each other, it is calculated to humble the pride of man, that he has been upon this globe all but six thousand years without a suspicion of the fact.
10 See London and Edinburgh Philosophical Magazine for December 1834. This experiment coincides with the theory regarding the internal heat of the earth, promulgated by a member of the French Institute (Mons. Cordier,) in a memoir presented to that association about six years since, in which he gives a detail of numerous observations and experiments on which he founded his theory, now fully confirmed by the more decisive experiment in England.
There are also problems concerning our climate which well deserve solution. The acknowledged difference between the eastern and western coasts of climates, has been attributed, with a great show of reason, to the prevalence of the westerly winds; and of the fact of their greater prevalence there, is the most satisfactory general evidence—but it is discreditable that the amount of the difference should not be as well ascertained as the fact itself. The average difference can be ascertained only by repeated and accurate observations.
It has also been asserted that the temperature of the Mississippi Valley is higher than that of the Atlantic coast. Mr. Jefferson long ago advanced this opinion, and it was adopted by Volney; but there is strong reason to believe that the direct contrary is the fact. It is, however, high time that this question should be settled by a series of thermometrical observations, and a comparison of facts derived from the vegetable world.
We have, Mr. President, been three years in existence, and as yet have done little. Let us bestir ourselves in the cause of science and of our country; and endeavor, under some disadvantages, to give Virginia the same rank in science and literature that she has always maintained in her devotion to civil liberty and political integrity. Though borne along with the rest of the world, by the great current of philosophy of which I have been speaking, we should not fold our arms in listless apathy, but diligently ply our oars, lest we should be left further behind by those in advance of us, and be overtaken by those now in our rear.