It appeared to the commodore, in the correspondence had with some of the British officers, that in certain cases where they had boarded vessels under the flag of the United States, not having the right of search, threats had been used of detaining and sending them to the United States squadron. This he remarked was improper, and must not be admitted, or any understanding had with them authorizing such acts; adding, in substance, that if they chose to detain suspicious vessels, they must do it upon their own responsibility, without our assent or connivance. Refusing to the British government the right of search, our government has commanded us to prevent vessels and citizens of the United States from engaging in the slave-trade. These duties we must perform to the best of our ability, and we have no right to ask or receive the aid of a foreign power. “It is desirable to cultivate and preserve the good understanding which now exists between the two services; and should any differences arise, care must be taken that the discussions are temperate and respectful. You have full authority to act in concert with the British forces within the scope of our orders and duty.” On the same day, the Perry again sailed for the south coast, and after boarding several vessels, which proved to be legal traders, a _slaver_ was captured, and made the subject of a communication, dated June 7th, 1850. [Illustration: _Lith. of Sarony & Co. N. Y._ U. S. BRIG PERRY. AMERICAN SLAVE SHIP MARTHA. “off Ambria June 6ᵗʰ 1850”--]