Having, in my avocation as lecturer on "The African Race" and "America and the Americans," visited nearly the whole of Ireland, I respectfully submit the following letters and notices, the letters being from gentlemen who kindly presided at the meetings:-- From the Rev. DOCTOR FITZGERALD, Archdeacon of Kildare, (now Lord Bishop of Cork). "Professor Allen delivered some lectures on the African Race, in Kingstown, which seemed to have given general satisfaction. I regret that I was unable to attend more than one, but I can truly say that it bore evidence of a highly cultivated mind, and imparted valuable information in a pleasing form. From what I have seen and heard of Professor Allen, I should be glad to think that any testimony of mine could be of service to him. "W. FITZGERALD, Archdeacon of Kildare, (Now Lord Bishop of Cork.) "Dublin, Nov. 1856" From Rev. DOCTOR URWICK, Dublin. "I have known Professor Allen since his first coming to Ireland, and believe him to be a gentleman of high character and attainments. His lecturings, more than one of which I have heard, display much power, and by the amount of information they contain, united with a clear and often eloquent style, and earnest manner, cannot fail, at once, to interest and instruct the audience. I cordially commend him to the confidence and kind attention of my friends. "W. URWICK. "Dublin, Nov. 30, 1857." From CORK--see "Constitution," "Examiner" and "Reporter," March 1858. "Cork, Feb. 28, 1858. "To WILLIAM G. ALLEN, Esq. late Professor of Greek in New York Central College. "DEAR SIR--We, the undersigned, having heard your lectures on 'America' and 'Africa,' and derived therefrom much instruction as well as gratification, do, on our own part and that of many of our fellow citizens who are anxious to hear you, respectfully request that you will give, at least, two lectures more upon these interesting subjects. "(Signed) HENRY MARTIN, Congregational Minister. R. W. FORREST (Free Church). RICHD. CORBETT, M. D. J. D. CARNEGIE. HENRY UNKLES. GEORGE BAKER. RICHARD DOWDEN, (Rd.) WILLIAM MAGILL, (Scots' Church). JOSEPH R. GREENE, Professor, Queen's Coll. THOMAS JENNINGS. N. JACKSON, C. E. JOSEPH COLBECK." From "Belfast News-letter," Dec. 10, 1858. "REV. DOCTOR COOKE occupied the chair. Professor Allen then delivered a lecture of great ability and interest. Dr. Cooke said he had listened to a remarkable oration. He was glad he had heard it. He thanked Professor Allen, in the name of the meeting, for his truly valuable and instructive lecture." From the DEAN OF WATERFORD.