The proceedings of the French Government with relation to Spain, now began to excite a good deal of attention in this country; appearances being in favour of the supposition generally entertained, that the labours of Wellington in the Peninsula were about to be rendered nugatory by the presence there of a powerful French army, and the consequent return of Spain to the position she held as a French dependency before the war. THE RIGHT HON. CHARLES W. WYNN TO THE DUKE OF BUCKINGHAM. Tuesday evening. MY DEAR B----, I do not believe that the French Cabinet is mad enough to entertain any view of the conquest of Spain. Experience must have taught even to them more wisdom, but Monsieur and the Ultra-Royalist party dread the intercourse with a _Republic_ on their frontiers, and besides, have revived the old notions of the family connexion, and their duty to protect a Bourbon monarch. This is fed by their communications with Spain, where for the last ten months they have been active in exciting, both by money and other means, the Royalist or insurgent party, and these designs are equally instigated by the Ultra-Royalist and Ultra-Liberal party in both countries. The former, with the view of re-establishing the authority of the beloved Ferdinand; the latter, of raising by any means a war, which they calculate must end in the overthrow of both thrones. We have no wish ourselves to take Cuba, but are inclined to give her the fair option of either continuing Spanish, becoming independent, or uniting with Mexico, positively resisting, however, even if necessary with arms, her occupation by any third power, _i.e._, North America. I continue most completely separated from the rest of the Cabinet. Whether they live at all together I know not, but believe they do. However, we have all been in town now for more than a week, and I never have seen anything of any of them except in Cabinet. No one dinner have I been asked to since the conclusion of the Session, excepting one in the beginning of September at Robinson's. Now we all know that business can never be really settled in the meetings of so numerous a Cabinet, but that it must be _in fact_ arranged at more private meetings and dinners.