The Russo-american Alliance

Wo hear that Communications have been rcoeived from an Eng]ish source, accortiiug to which we must prepare oursehesfor the approaching ratification of an offensioe and defensive alhance lehveen St. Petersburg and Washington. This eventuality, should this somewhat spcculative information be confirmed, would principally affcot the hearings of the Mexican and Polish questions. From the London Tost, (Government organ ) Aug. 22d, 1863. We learn frora the Sootia's news that an offensive and defensive alliance is roported to have been concluded between the United States and Russia. Mr. Cassius Marous Clay, whoso particular fricndly utterances regarding England are in most people's recollection, is the reported hero of this interesting and natural fraternizaron. In the event of the Western Powers, deelaring war against Kussi-, we are told that the Unitod States would declare war against Frasee and England. No doubt the elemcnts and conditions of sympathy and fricndly fceling are nbundant just now between Washington and St. Petersburg. It is proverbial how wondrous kind a fellow feeling makes us. In respect to Poland and the Southern Confederacy, the relativo positions of Eussia and the United States aro identieal. Kussia refuses to offer mediation between the North and South ; the United States refueed to medíate - in conjunetion with the Western powers of Europe - in the Polish question. Of course the United States would be glad of a Europuan war in which Franco and England would be engaged ; and Russia would be no lessglad of a war between these two Powers and the United States. The more England and France had on their hands in the Old World the more the Federal governmeut could have it all its own way in the New, and might net even yet despair, uuder favorable circumstances, of being able to revive and to carry into practice the eherished project of Monroe. And if England had to defend Canada, and France to maintain itself in Mexico, and loth to wage a maritime war against the largest mercantile marine in the world turned into jleets of privateers, preying upon their enemies' commerce in every quarter of the globe ( for the United States were no party to the alolition of these sea freeboo'ers), Russia might wreak her vengeanco upon Poland in secunty and peace. If this report of a Russo-Federal alliance were to prove unfounded, its origin and existeuee might easily be accounted for by cireunistances which ronder it so likely a problem. It is reported that several Oabinet uaeolings at Washington resulted in a delerminatiou to demand of France the abandonment of the mouarehial scbenie in Mexico, and it is not all improbable that serious oomplications may arise from the cause and in the quarter indicated.