"The manufacturing industry of this island, colossal as is the fabric which it has raised, rests principally on no other base than our fortunate position with regard to the rocks of this series. Should our coal mines ever be exhausted, it would melt away at once, and it need not be said, that the effect produced on private and domestic comfort would be equally fatal with diminution of public wealth; we should lose many of the advantages of our high civilization, and much of our cultivated grounds must be again shaded with forests, to afford fuel to a remnant of our present population. That there is a progressive tendency to approach this limit, is certain, but ages may yet pass before it is felt very sensibly; and when it does approach, the increasing difficulty and expense of working the mines of coal, will operate, by successive and gradual checks, against its consumption, through a long period, so that the transition may not be very violent; our manufactures would first feel the shock; the excess of population, supported by them, would cease to be called into existence, as the demand for their labor ceased; the cultivation of poor lands would become less profitable, and their conversion into forests more so."
Where is the state in this union—I might, perhaps, safely ask, where is the country in the world, that can surpass Virginia in the variety of position and abundance of supply of this valuable combustible? She possesses, not only in common with her sister states, a liberal quantity of bituminous coal in her western and carbonaceous regions, where, according to geological calculations, bituminous coal might be reasonably expected to be found; but in the eastern division of the state, within a few miles of the tide water of a majestic stream, which empties its ample waters into the Atlantic ocean, in a geological position, where bituminous coal never would have been sought after, because bituminous coal could not there have ever been expected to have been found, bituminous coal of a good quality, and apparently in great abundance, has been found; nature seeming, as it were, in this instance, to enable her to favor an otherwise highly favored land, to have defied all her own rules, and baffled the skill of the gravest geologist, by depositing bituminous coal upon the naked and barren bosom of the uncarbonaceous granite! I have often wondered why this anomaly did not strike the capacious and highly gifted mind of Jefferson, and why he, or some other of the many reflecting men of Virginia, was not led by it to inquire, what else there might be in store for the good people of that state? By neglecting to seek for them, we ungratefully reject the proffered kindness of our Creator; the laws of inanimate matter are, in this respect, in unison with those that govern animated nature; we are furnished with the material and means, but in order to stimulate us to useful and healthful industry, we must labor in their appropriation. God gives us the earth and the seed, but we must plough and sow, or we can never reap; so he has bountifully placed within our reach innumerable valuable rocks, minerals and combustibles, but to enjoy them, we must delve into the bowels of the earth—and having found them, we must, by various laborious processes, render them fit for our use. To those who are accustomed to regard these things, it is difficult to determine which causes the most painful sensations, to observe how few coal mines, in comparison to what might be, are opened in the neighborhood of Richmond, or the want of skill exhibited in the selection and working of those recently opened. Nor is the deposite of the bituminous coal upon the granite, the only geological anomaly of this quarter. Proceeding from Charlottesville towards Richmond, almost immediately after you leave the Talcose formation of the Blue Ridge, you are astonished at the fertility of the soil; you can scarcely persuade yourself that you are travelling over a country of primitive rocks. Soon, however, you discover that the fertility is not universal, but confined to patches of a brick-red covering, that overlay the disintegrated materials of the primordial formations, and upon seeking further into this curious matter, your surprise is not a little increased, upon discovering that this brick-red covering owes its existence to the disintegration of a rock, which, in most other places, is exceedingly slow to decompose, and which, when decomposed, forms a cold and inhospitable soil. It is the hornblende sienite. Here it is surcharged with iron, which oxidating by exposure to the atmosphere and moisture, the rock freely disintegrates, and the oxide of iron being set at liberty, imparts its coloring to the ground, and fertilizes the soil in an extraordinary degree.
Professor Hitchcock, in his report of a geological survey of Massachusetts, makes the following remarks in relation to the effect of iron upon a soil:
"No ore except iron occurs in sufficient quantity in the state, to deserve notice in an agricultural point of view. In the west part of Worcester county, the soil, for a width of several miles across the whole state, is so highly impregnated with the oxide of iron, as to receive from it a very deep tinge of what is called iron rust. This is particularly the case in the low grounds; where are frequently found beds of bog ore. I do not know very definitely the effect of this iron upon vegetation; but, judging from the general excellence of the farms in the Brookfields, Sturbridge, Hardwicke, New Braintree, Barae, Hubbardston, &c., I should presume it to be good. Certainly, it cannot be injurious; for no part of the county exceeds the towns just named, in the appearance of its farming interest—and nearly all the county, as may be seen by the map, is of one formation. It would be an interesting problem, which in that county can be solved, to determine the precise influence of a soil highly ferruginous upon vegetation."
Next in geological and statistical importance, I would place the mineral springs of Virginia; and these would form a legitimate subject of investigation to those who should be appointed to conduct a geological survey.
I am not aware of any portion of country of the same extent, possessing an equal number and variety of mineral springs, as the counties of Bath, Greenbrier and Monroe. This is a subject upon which one might easily compose a book, but I must confine myself to a few lines. The waters are thermal and cold; the former of various degrees of intensity. They hold in solution a variety of metals, earths, acids, and alkalies, combined in various proportions, and suited to relieve the sufferings of invalids from a number of diseases. Mineral springs of less interest than these, have excited the attention of the learned in almost every age and country; and Virginia owes it to her high mental standing, independently of every other consideration, to assist the cause of science, by investigating the causes of the high temperature, and making accurate analyses of these waters. It is the duty of states, as it is of individuals, to furnish their quota to the general stock of information; and this is peculiarly the duty of a republican state, whose happiness, nay, whose very political existence, depends upon an improved state of the minds of its citizens. Mr. John Mason Good, in his "Book of Nature," after describing the barren state of society in the middle ages, says, "we have thus rapidly travelled over a wide and dreary desert, that, like the sandy wastes of Africa, has seldom been found refreshed by spots of verdure, and what is the moral? That ignorance is ever associated with wretchedness and vice, and knowledge with happiness and virtue. Their connections are indissoluble; they are woven in the very texture of things, and constitute the only substantial difference between man and man," and I would add, between state and state.
Has the heat of these waters any connection with volcanic phenomena? Or is the temperature entirely chemical, originating in the decomposition of sulphuret of iron, as I suggested some years ago in a paper published upon the subject? At the Hot Springs, the hot sulphur water and the cold pure water, issue out of the calcareous rock at the base of the Warm Spring mountain, within a few feet of each other. One of these Virginia Springs, makes a copious deposite of calcareous tufa; and at another, you perceive newly formed crystals of sulphate of iron. The White Sulphur Spring takes its name from a rich white deposite, and the Red Sulphur from one of that color. If this is not an uncommon and a highly interesting section of country, calling aloud for investigation, and meriting legislative interference, then have I taken an entirely erroneous view of the subject.
The Warm Spring mountain is white sandstone. The rocks of the valley of the Hot Springs are calcareous, argillaceous and silecious; they are all nearly vertical. At first the two former, and afterwards the two latter, alternate. They have all been deposited in a horizontal position, and between their narrow strata are thin layers of clay covering organic remains.—Those of the lime and slate are principally zoophytes. That of the silecious is the fossil described by Doctor R. Harlan, from a specimen obtained by me in the western part of the state of New York. He supposed it to be a now extinct vegetable fossil of the family fucoides, and he has called it Fucoide Brongniard,—in honor of M. Brongniard. But I suppose it to be animal, and to belong to the family of the Encrinites.1
1 See an essay of Richard C. Taylor, F. G. S. on the geological position of certain beds which contain numerous fossil marine plants of the family fucoides; near Lewistown, Mifflin county, Pennsylvania, in vol. I. part I. of the Transactions of the Geological Society of Pennsylvania, page 1.
The mountain ranges of Virginia are more numerous, and the valleys consequently narrower, than they are in Pennsylvania; but some of them are very interesting. The great valley, as it is sometimes called, or par excellence, the valley, situate between the Blue Ridge and the North and Alleghany Mountain, is by far the most extensive. The rocks often obtrude, rendering the soil rather scanty, but nevertheless this is a fine district of country.