The curtain has fallen on another act of the Spanish drama, Isturitz having been civilly sent out of this country. The papers present a case all to our advantage. Bulwer's despatch of May 30, in vindication of himself, was very well done, and Palmerston's last note to Isturitz excellent. The Spaniards have played their cards (not bad ones originally) so miserably ill, that they have given the game to our Foreign Office, though it is difficult to say what the stake is worth; they are, however, like people who had a very good hand, but revoked at a critical moment, and so lost the game. Bulwer and Palmerston are triumphantly curvetting about, completely smashing their antagonists in argument, partly because the latter are blunderers who have deceived themselves and been misled by others, and partly because they cannot put forth their true case and the reasons which have influenced them. They know perfectly well that Palmerston and Bulwer have all along moved heaven and earth to keep or drive Narvaez out of office, and Montpensier out of Spain, while Sotomayor has put forward frivolous or unsustainable pretexts for the violent and rash course they have adopted. Narvaez is compelled to keep back the real case he had against Bulwer, and the cause of his animosity towards him. He knows that Bulwer tried to prevent his coming into power; that he was the life and soul, the leader and director of the faction opposed to him, whom he instigated to adopt the most violent measures. I read in Bulwer's own handwriting an account of his proceedings and of the failure of his schemes. It was through Serrano all this was to be done, but Serrano was under the influence of his mother, and Narvaez of his doctor, and these were both corrupted by the other side. This was the cause of failure. Then Serrano, as all the world knows, was himself brought over, and he has since given to Narvaez in writing a detailed account of his communication with Bulwer, and of the conduct of the latter, but in which the Queen is so implicated and compromised, that it is impossible for Narvaez to make any use of it. This Guizot (who knows everything that passes at Madrid) told Reeve, and I have no doubt it is true, because it corresponds with that letter of Bulwer's which I myself saw. This is the secret history of the matter. [Sidenote: AN IMPENDING CRISIS.]