As this most important measure occurred at the very period when the power of Cimon was weakened by the humiliating circumstances that attended his expedition to Ithome, and by the vigorous and popular measures of the opposition, so there seems every reason to believe that it was principally advised and effected by Pericles, who appears shortly afterward presiding over the administration of the finances. [220] Though the Athenian commerce had greatly increased, it was still principally confined to the Thracian coasts and the Black Sea. The desire of enterprises, too vast for a state whose power reverses might suddenly destroy, was not yet indulged to excess; nor had the turbulent spirits of the Piraeus yet poured in upon the various barriers of the social state and the political constitution, the rashness of sailors and the avarice of merchants. Agriculture, to which all classes in Athens were addicted, raised a healthful counteraction to the impetus given to trade. Nor was it till some years afterward, when Pericles gathered all the citizens into the town, and left no safety-valve to the ferment and vices of the Agora, that the Athenian aristocracy gradually lost all patriotism and manhood, and an energetic democracy was corrupted into a vehement though educated mob. The spirit of faction, it is true, ran high, but a third party, headed by Myronides and Tolmides, checked the excesses of either extreme. V. Thus, at home and abroad, time and fortune, the concurrence of events, and the happy accident of great men, not only maintained the present eminence of Athens, but promised, to ordinary foresight, a long duration of her glory and her power. To deeper observers, the picture might have presented dim but prophetic shadows. It was clear that the command Athens had obtained was utterly disproportioned to her natural resources--that her greatness was altogether artificial, and rested partly upon moral rather than physical causes, and partly upon the fears and the weakness of her neighbours. A steril soil, a limited territory, a scanty population--all these--the drawbacks and disadvantages of nature--the wonderful energy and confident daring of a free state might conceal in prosperity; but the first calamity could not fail to expose them to jealous and hostile eyes. The empire delegated to the Athenians they must naturally desire to retain and to increase; and there was every reason to forbode that their ambition would soon exceed their capacities to sustain it. As the state became accustomed to its power, it would learn to abuse it. Increasing civilization, luxury, and art, brought with them new expenses, and Athens had already been permitted to indulge with impunity the dangerous passion of exacting tribute from her neighbours. Dependance upon other resources than those of the native population has ever been a main cause of the destruction of despotisms, and it cannot fail,