Mr. Thompson, however, has not contented himself with urging a particular controversy with Dr. Cox;--nor even a general controversy, free for all who desire to engage him, or call in question his 'charges against America, and American Ministers'--as slave-holding Ministers and Christians on the other side of the water. 'But,' says he, 'I am ready, also, and anxious to meet any American clergyman, or other gentleman, in any part of Great Britain, to discuss the general question, &c.:' that is, the general question of his 'charges against America and American ministers, touching the whole subject of African slavery in that country.' AFTER mature and prayerful consideration, and full consultation with a few friends, I am not able to see how I can avoid taking notice of this direct, and almost personal challenge; which, I have some reason to suspect, was probably intended for me. AND yet I feel myself encompassed by many difficulties. For some may consider me defending the institution of slavery; whereas I myself believe it to be contrary to the spirit of the gospel, and the natural rights of men. Others might naturally look for more full proofs, and more exact information than I can give, when relying almost entirely upon mere memory. While by far the greater part, I much fear, are as impatient of all investigation on the subject, as, I am sorry to say, they seem to me, totally unacquainted with its real condition in America. I have concluded, however, to accept the somewhat boastful challenge of Mr. Thompson. And I trust the following suggestions and conditions will be considered most reasonable, when the peculiar circumstances of the case are considered:-- 1. I will meet Mr. Thompson at Glasgow, any time during the three first weeks of June; and spend three or four hours a day, for as many days consecutively as may be necessary--in discussing the 'general question,' as involved in his 'charges against America, and American Ministers,' in reference to the whole subject of slavery there. 2. BUT as my whole object is to get before the British churches certain views and suggestions on this subject, which I firmly believe are indispensable, to prevent the total alienation of British and American christians from each other; I shall not consider it necessary to commence the discussion at all, unless such arrangements are previously made, as will secure the publication, in a cheap and permanent form, of all that is said and done on the occasion. 3. I must insist on a patient and fair hearing, by responsible persons. Therefore I will agree that the audience shall consist of a select number of gentlemen, say from fifty to five hundred; to be admitted by ticket only,--and a committee previously agreed on to distribute the tickets--only to respectable persons.