Niagara River runs nearly in a due south direction, and falls into Lake Ontario on the southern shore, about thirty miles to the east-ward of the western extremity of the lake. It is about three hundred yards wide at its mouth, and is by far the largest body of water flowing into Lake Ontario. On the eastern side of the river is situated the fort, now in the possession of the people of the States, and on the opposite or British side the town, most generally known by the name of Niagara, notwithstanding that it has been named Newark by the legislature. The original name of the town was Niagara, it was afterwards called Lenox, then Nassau, and afterwards Newark. It is to be lamented that the Indian names, so grand and sonorous, should ever have been changed for others. Newark, Kingston, York, are poor substitutes for the original names of these respective places, Niagara, Cataragui, Toronto. The town of Niagara hitherto has been, and is still the capital of the province of Upper Canada; orders, however, had been issued, before our arrival there, for the removal of the seat of government from thence to Toronto, which was deemed a more eligible spot for the meeting of the legislative bodies, as being farther removed from the frontiers of the United States. This projected change is by no means relished by the people at large, as Niagara is a much more convenient place of resort to most of them than Toronto; and as the governor who proposed the measure has been removed, it is imagined that it will not be put in execution. The removal of the seat of government from Niagara to Toronto, according to the plan laid down, was only to have been a preparatory step to another alteration: a new city, to have been named London, was to have been built on the river formerly called La Trenche, but since called the Thames, a river running into Lake St. Clair; and here the seat of government was ultimately to have been fixed. The spot marked out for the site of the city possesses many local advantages. It is situated in a healthy fertile country, on a fine navigable river, in a central part of the province, from whence the water communication is extensive in every direction. A few settlements have already been made on the banks of the river, and the tide of emigration is setting in strongly towards that quarter; at a future day, therefore, it is by no means improbable but that this spot may be deemed an eligible one for the capital of the country; but to remove the seat of government immediately to a place little better than a wilderness, and so far from the populous parts of the province, would be a measure fraught with numberless inconveniencies to the public, and productive apparently of no essential advantages whatsoever. [Sidenote: NIAGARA TOWN.]