_September 4th._--At The Grove for a couple of days, where I had much talk with Clarendon, and he showed me a great many papers about different matters: a very good letter written by Prince Albert to the King of Prussia, who had written to him a hypocritical letter, asking where the English and French fleets were going to winter, and whether he might depend on them in case he was attacked by Russia in the Baltic, which Clarendon said was a mere artifice to obtain knowledge of our plans, that he might impart them to the Emperor Nicholas, as he well knew he was in no danger of being attacked by Russia. The Prince wrote an excellent answer, giving him no information, and entering into the whole question of Prussian policy without reserve. He starts to-day to Boulogne, invited by a letter from the Emperor himself, beginning 'Mon cher frère,' replied to very well and civilly by Prince Albert who began, 'Sire et mon cher frère.' Clarendon said Aberdeen was as hot as any one upon the Crimean expedition. They are not at all satisfied with Lord Raglan, whom they think oldfashioned and pedantic, and not suited to the purpose of carrying on active operations. They wanted him to make use of the Turkish light cavalry, Bashi-Bazouks, who under good management might be made very serviceable, but he would have nothing to say to them; and still more they are disgusted with his discouragement of the Indian officers who have repaired to the army, and who are, in fact, the most efficient men there are. They look on General Brown as the best man there, and have great expectations of Cathcart. It is very curious that neither the Government nor the commanders have the slightest information as to the Russian force in the Crimea or the strength of Sebastopol. Some prisoners they took affirmed that there were 150,000 men in the peninsula, but nobody believes that, except Dundas who gives credit to it. They are impatient for the termination of Dundas's period of service, which will be in December, when Lyons will command the fleet.