Stability, on the contrary, requires that the hands in which power is lodged should continue for a length of time the same. A frequent change of men will result from a frequent return of elections; and a frequent change of measures from a frequent change of men: whilst energy in government requires not only a certain duration of power, but the execution of it by a single hand. How far the convention may have succeeded in this part of their work, will better appear on a more accurate view of it. From the cursory view here taken, it must clearly appear to have been an arduous part. Not less arduous must have been the task of marking the proper line of partition between the authority of the general and that of the State governments. Every man will be sensible of this difficulty, in proportion as he has been accustomed to contemplate and discriminate objects extensive and complicated in their nature. The faculties of the mind itself have never yet been distinguished and defined, with satisfactory precision, by all the efforts of the most acute and metaphysical philosophers. Sense, perception, judgment, desire, volition, memory, imagination, are found to be separated by such delicate shades and minute gradations that their boundaries have eluded the most subtle investigations, and remain a pregnant source of ingenious disquisition and controversy. The boundaries between the great kingdom of nature, and, still more, between the various provinces, and lesser portions, into which they are subdivided, afford another illustration of the same important truth. The most sagacious and laborious naturalists have never yet succeeded in tracing with certainty the line which separates the district of vegetable life from the neighboring region of unorganized matter, or which marks the termination of the former and the commencement of the animal empire. A still greater obscurity lies in the distinctive characters by which the objects in each of these great departments of nature have been arranged and assorted. When we pass from the works of nature, in which all the delineations are perfectly accurate, and appear to be otherwise only from the imperfection of the eye which surveys them, to the institutions of man, in which the obscurity arises as well from the object itself as from the organ by which it is contemplated, we must perceive the necessity of moderating still further our expectations and hopes from the efforts of human sagacity. Experience has instructed us that no skill in the science of government has yet been able to discriminate and define, with sufficient certainty, its three great provinces the legislative, executive, and judiciary; or even the privileges and powers of the different legislative branches. Questions daily occur in the course of practice, which prove the obscurity which reins in these subjects, and which puzzle the greatest adepts in political science.