But, on the other hand, experience also proved that to collect any very considerable quantity of the metal required the expenditure not only of a vast amount of most disagreeable and exhausting labor, but also of a great quantity of other commodities. So that the people who, at the outset, abandoned their various occupations of raising wheat, making coats, building boats, baking bread, and constructing stone walls and chimneys, and betook themselves to digging gold, soon learned that, as a general rule, the results of a day's labor thus employed purchased no more of useful or desirable commodities--meat, drink, clothes, etc.--than the results of a similar amount of labor exerted in the most ordinary occupations; and not a few even were ready to assert, as the result of their individual experience, that a man could do better for himself in the way of earning a living by following any and every other occupation rather than that of seeking for gold. [11] Accordingly, after trying it for a little while, the most skilled laborers left the gold regions and went back to their old occupations; and these, in turn, were followed by the unskilled laborers in such numbers, that had it not been for the encouragement growing out of the hope of suddenly enriching themselves through the chance discovery of a great nugget (as sometimes happened), the mines would have been entirely deserted. As it was, the supply of gold greatly fell off, and, the demand for it remaining about the same, the purchasing power of the stock on hand for other commodities gradually increased, until it came about that the result of an average day's labor in digging gold was found to buy more than the result of an average day's labor in other occupations. But as soon as this was observed, an additional supply of labor went back to gold-mining, and continued to follow it, until an equalization of results from effort in gold-digging and effort in other corresponding employments was again established, as before related. And this interchange of employments and equalization of results from labor went on, year by year, until at last the people, as it were by instinct, found out that a given quantity of gold represented more permanently a given amount of a certain grade or kind of human labor or effort than any other one substance. And the moment this fact became apparent, the people on the island for the first time also clearly perceived that gold, in addition to the universal exchanging quality or purchasing power which it had before naturally acquired, from the circumstance that every body from the time of its first discovery wanted it, had further acquired two other attributes, which fitted it, above all things else, to serve as money; namely, and first, that it had become a measure or standard of value, by which, as by a yard-stick, the comparative value of all other commodities might be measured or estimated; and, second,