The danger which menaces the Union will become far greater after the success of the Unionists than it was during the war, because the extinction of the principle of States Rights will naturally tend to centralise the power of the Federal Government. They cannot restore that which they have pulled down. In virtue of their own principles, they must maintain a strict watch and supreme control over the State Governments and Legislatures. Endless disputes and jealousies will arise. The Democrats, at once the wealthiest and the ablest party in each State, will take every opportunity of opposing the centralised Government; and although the Republicans may raise armies to fight for the Union, they will not be able to prevent the slow and certain action of the State Legislatures, which will tend to detach the States more and more from any federation in which their interests are not engaged, and to form them into groups, bound together by community of commerce, manufacture, feeling, and destiny. Canada must of course accept its fate with the rest; but Englishmen, at least, will not yield it to the menaces or violence of the Northern Americans, as long as the people of the province prefer being our fellow-subjects to an incorporation in the Great Republic, or any section of it that may be desirous of the abstraction. I fear we mostly look at Mr. Seward’s conduct and language from a point which causes erroneous inferences. It should be remembered that he is an American minister--that he has not only the interests but the passions and prejudices of the American people to consult, and that, like Lord Palmerston, he is not the minister of any country but his own. His son, the Under-secretary of State, is the proprietor and editor of a journal here, which is conducted with the moderation and tact to be expected from the amiable character of the gentleman alluded to. There was little to be seen of the towns at which we halted, and our journey was continued from one to the other monotonously enough. The weary creeping of the train, the foul atmosphere, the delays, however inevitable and unavoidable, rather spoiled one’s interest in the black smoky-looking cities on the white plains through which we passed; and night found us still “scrooging on,” and occasionally stopping and digging out. Thus we passed by Rochester and the Genessee Falls, which seem extensively used up in mill-working, and arrived at Buffalo (278 miles) a little before midnight. There we branched off to Niagara, which is 22 miles further on.