Agreement Between Mr. Astor and the Russian Fur Company--War Between the United States and Great Britain.--Instructions to Captain Sowle of the Beaver--Fitting Out of the Lark.-- News of the Arrival of Mr. Stuart. IT is now necessary, in linking together the parts of this excursive narrative, that we notice the proceedings of Mr. Astor in support of his great undertaking. His project with respect to the Russian establishments along the northwest coast had been diligently prosecuted. The agent sent by him to St. Petersburg, to negotiate in his name as president of the American Fur Company, had, under sanction of the Russian government, made a provisional agreement with the Russian company. By this agreement, which was ratified by Mr. Astor in 1813, the two companies bound themselves not t

