What makes it the more important to understand the present mechanism of national government, and to study the methods of congressional rule in a light unclouded by theory, is that there is plain evidence that the expansion of federal power is to continue, and that there exists, consequently, an evident necessity that it should be known just what to do and how to do it, when the time comes for public opinion to take control of the forces which are changing the character of our Constitution. There are voices in the air which cannot be misunderstood. The times seem to favor a centralization of governmental functions such as could not have suggested itself as a possibility to the framers of the Constitution. Since they gave their work to the world the whole face of that world has changed. The Constitution was adopted when it was six days' hard traveling from New York to Boston; when to cross East River was to venture a perilous voyage; when men were thankful for weekly mails; when the extent of the country's commerce was reckoned not in millions but in thousands of dollars; when the country knew few cities, and had but begun manufactures; when Indians were pressing upon near frontiers; when there were no telegraph lines, and no monster corporations. Unquestionably, the pressing problems of the present moment regard the regulation of our vast systems of commerce and manufacture, the control of giant corporations, the restraint of monopolies, the perfection of fiscal arrangements, the facilitating of economic exchanges, and many other like national concerns, amongst which may possibly be numbered the question of marriage and divorce; and the greatest of these problems do not fall within even the enlarged sphere of the federal government; some of them can be embraced within its jurisdiction by no possible stretch of construction, and the majority of them only by wresting the Constitution to strange and as yet unimagined uses. Still there is a distinct movement in favor of national control of all questions of policy which manifestly demand uniformity of treatment and power of administration such as cannot be realized by the separate, unconcerted action of the States; and it seems probable to many that, whether by constitutional amendment, or by still further flights of construction, yet broader territory will at no very distant day be assigned to the federal government. It becomes a matter of the utmost importance, therefore, both for those who would arrest this tendency, and for those who, because they look upon it with allowance if not with positive favor, would let it run its course, to examine critically the government upon which this new weight of responsibility and power seems likely to be cast, in order that its capacity both for the work it now does and for that which it may be called upon to do may be definitely estimated.