At the Christian era the metallic money of the Roman Empire amounted to $1,800,000,000. By the end of the fifteenth century it had shrunk to less than $200,000,000. During this period a most extraordinary and baleful change took place in the condition of the world. Population dwindled and commerce, arts, wealth, and freedom all disappeared. The people were reduced by poverty and misery to the most degraded conditions of serfdom and slavery. The disintegration of society was almost complete. The conditions of life were so hard that individual selfishness was the only thing consistent with the instinct of self-preservation. All public spirit, all generous emotions, all the noble aspirations of man shriveled and disappeared as the volume of money shrunk and as prices fell. History records no such disastrous transition as that from the Roman Empire to the Dark Ages. Various explanations have been given of this entire breaking down of the frame-work of society, but it was certainly coincident with a shrinkage in the volume of money, which was also without historical parallel. The crumbling of institutions kept even step and pace with the shrinkage in the stock of money and the falling of prices. All other attendant circumstances than these last have occurred in other historical periods unaccompanied and unfollowed by any such mighty disasters. It is a suggestive coincidence that the first glimmer of light only came with the invention of bills of exchange and paper substitutes, through which the scanty stock of the precious metals was increased in efficiency. But not less than the energizing influence of Potosi and all the argosies of treasure from the New World were needed to arouse the Old World from its comatose sleep, to quicken the torpid limbs of industry, and to plume the leaden wings of commerce. It needed the heroic treatment of rising prices to enable society to reunite its shattered links, to shake off the shackles of feudalism, to relight and uplift the almost extinguished torch of civilization. That the disasters of the Dark Ages were caused by decreasing money and falling prices, and that the recovery therefrom and the comparative prosperity which followed the discovery of America were due to an increasing supply of the precious metals and rising prices, will not seem surprising or unreasonable when the noble functions of money are considered. Money is the great instrument of association, the very fiber of social organism, the vitalizing force of industry, the protoplasm of civilization, and as essential to its existence as oxygen is to animal life. Without money civilization could not have had a beginning; with a diminishing supply it must languish, and, unless relieved, finally perish.