Yesterday I found Clarendon at the Board of Trade, and had a very long conversation with him; he is now all for trying to make something of the proposal to get the Salic Law re-established in Spain, having in the first instance scouted it. It was first proposed to him by Baron Billing as a solution of the difficulty; he at once rejected it as impossible. Now he has changed his mind, and he wrote to Palmerston and Lord John to say so, and to propose writing to Billing to ask whether he had made this proposal with the knowledge and assent of Guizot, and if the French Government was prepared to assist in procuring such a settlement at Madrid. Lord John expressed doubts, and thought nothing would come of it but some fresh falsehood and deceit. Palmerston thought the plan a good one, and that it was worth while to write to Billing, which Clarendon had done, and he showed me the letter. I think the scheme utterly chimerical, and so I told him; in fact, it strikes me as one of the most absurd and impracticable that ever entered the mind of man. I stated the different objections that occurred to me, one (not the least) being that no Spaniard would be likely to support a measure almost sure eventually to produce another civil war. He said that before Olozaga left Paris he had been to William Hervey, who asked him if he would be willing to support such a measure. He replied that he would, and he thought all the Progressista party would likewise; but while he now looks to this as a possible solution of our difficulty, Clarendon is very anxious by some means to restore a good understanding, and he begged me to tell Guizot that if his language in the King's Speech and in the Chambers was moderate, he would compel a corresponding moderation here, but at the same time he informed me that it was Palmerston's intention to supply Thiers with information to use against Guizot; and he said this without any expression of disapprobation. It was at the end of our conversation, but the next day, upon reflecting on this, I wrote him a very strong letter denouncing the impolicy and the danger of such a communication to such a man. I might have also urged the immorality of it, and its inconsistency with the profession of not wanting to injure Guizot or turn him out; the more I think of this the more shocked I am. If it is done, and Thiers exhibits good information, the French Government will know well enough how he came by it. [Sidenote: LORD PALMERSTON ON THE SPANISH MARRIAGE.]