After so many centuries of experiment, in which hardly a possible source of state revenue has escaped attention, some knowledge of the great principles of taxation might have been evolved. Unfortunately, the experience of one nation is not accepted as containing lessons applicable to the needs or conditions of another, and one generation rarely appeals to history save to defend its own experiments. Ignorance, half knowledge, which is quite as dangerous, and interest guide or influence legislation, and those who predict failure or danger are regarded as theorists, and denounced as unpractical. Nowhere is the tendency to move independent of enlightened knowledge more evident than in the United States. At every appearance of the tax question, State and national legislatures are overwhelmed with measures that have been tried in the past, and after a thorough test condemned beyond any hope of defense. Yet history shows the gradual disappearance of certain forms of taxation which enjoyed great popularity for a time, and accomplished the end of their creation in a crude and often cruel manner. Looking over long periods of time, it is seen that some advances have been made, rather from a change in the economic condition of the people than from a true appreciation of the principles in question. The development of popular liberty has been an essential factor, and the alterations in tax methods require a close analysis of the causes leading to the rise and dominance of political and constitutional principle. While it is true that a popular uprising against fiscal exactions usually marked the limit of endurance of an oppressive system, it is also true that the same uprisings marked the completion of one stage of political development, and the readiness or even the need of entering upon a new stage. In one sense the progress of a people toward civilization in its highest meaning may be illustrated by its fiscal machinery and methods of obtaining its revenue from the people. It will be of interest to glance at some of these passing phases which have generally come down to a late day, and are still to be found in activity in some of the most advanced states of Europe.