It is difficult to conjecture how men first came to know and use iron; for it is impossible to suppose they would of themselves think of digging the ore out of the mine, and preparing it for smelting, before they knew what would be the result. On the other hand, we have the less reason to suppose this discovery the effect of any accidental fire, as mines are only formed in barren places, bare of trees and plants; so that it looks as if nature had taken pains to keep that fatal secret from us. There remains, therefore, only the extraordinary accident of some volcano which, by ejecting metallic substances already in fusion, suggested to the spectators the idea of imitating the natural operation. And we must further conceive them as possessed of uncommon courage and foresight, to undertake so laborious a work, with so distant a prospect of drawing advantage from it; yet these qualities are united only in minds more advanced than we can suppose those of these first discoverers to have been.
With regard to agriculture, the principles of it were known long before they were put in practice; and it is indeed hardly possible that men, constantly employed in drawing their subsistence from plants and trees, should not readily acquire a knowledge of the means made use of by nature for the propagation of vegetables. It was in all probability very long, however, before their industry took that turn, either because trees, which together with hunting and fishing afforded them food, did not require their attention; or because they were ignorant of the use of corn, or without instruments to cultivate it; or because they lacked foresight to future needs; or lastily, because they were without means of preventing others from robbing them of the fruit of their labour.
When they grew more industrious, it is natural to believe that they began, with the help of sharp stones and pointed sticks, to cultivate a few vegetables or roots around their huts; though it was long before they knew how to prepare corn, or were provided with the implements necessary for raising it in any large quantity; not to mention how essential it is, for husbandry, to consent to immediate loss, in order to reap a future gain — a precaution very foreign to the turn of a savage's mind; for, as I have said, he hardly foresees in the morning what he will need at night.
The invention of the other arts must therefore have been
