About a fortnight ago, the subject of the following brief Memoir came to me, bearing with him a letter from a dear friend and distinguished abolitionist in the United States, from which the following is an extract: --'I seize my pen in haste to gratify a most worthy colored friend of mine, by giving him a letter of introduction to you, as he intends sailing this week (August 8th, 1842) for Liverpool and London, via New Orleans. His name is Moses Grandy