Democratic ideas will not be moderated in the New World till they have performed their destined end, and brought the Christian race to the shores of the Pacific." All the convulsions thus predicted have taken place with even greater force and consequences than the historian contemplated, and yet our Union is preserved in greater strength and more apparent durability than was thought possible by its most enthusiastic admirer. The practical common sense, the wise and exalted patriotism of the people, have brought order out of confusion, removed obstacles to progress, destroyed institutions inimical to liberty, and placed their country, its institutions and its government upon a higher plane of progress and duration than was thought to be possible by the wisest of its founders. All the causes and consequences of our general history fall properly within the scope of the political historian,-- it is our more limited and restricted duty to collect and preserve the data of a small, yet mighty, part of the whole country, and to show what exists to-day in a single county of a great State, what forces in the past produced that wonderful wealth and civilization, that wise and exalted patriotism, that tact and shrewdness in business, that astounding material development, which illustrates the wealth and wisdom of Westchester County.

BouxDAEY. -- The northern boundary line of Westchester County, as it is at present marked, was fixed at the time the county was erected November 1, 1683, and at the same time Long Island Sound was designated as the southern boundary, and the Hudson River a.s the western boundary. The line between New York and Connecticut has for more than two centuries been a matter of dispute between the two States, and consequently the Eastern boundary line only has a history to be traced.