After our work was in press, we received from Mr. William Boyle, Farmer at the Albert Model Farm in Ireland, the paper which is given below, kindly sent in reply to a series of questions proposed by the author. The Albert Model Farm is one of the Government institutions for the promotion of agriculture, by the education of young men in the science and the practice of farming; and from what was apparent, by a single day's examination of the establishment in our visit to it in August, 1857, we are satisfied of its entire success. The crops then growing were equal, if not superior, to any we have seen in any country. Much of the land covered by those crops is drained land; and having confidence that the true principles of drainage for that country must be taught and practiced at this institution, we thought it might be instructive, as well as interesting to the farmers of America, to give them the means of comparison between the system there approved, and those others which we have described. Had the paper been sooner received, we should have referred to it earlier in our book; yet coming as it does, after our work was mostly in type, we confess to some feeling of satisfaction, at the substantial coincidence of views entertained at the Albert Model Farm, with our own humble teachings. With many thanks to Mr. Boyle for his valuable letter, which we commend to our readers as a reliable exposition of the most approved principles of land-draining for Ireland, we give the paper entire: ALBERT MODEL FARM, Glasnevin, Dublin, January 31, 1859. To the Hon. HENRY F. FRENCH, Exeter, N. H.: SIR:--Your queries on land-drainage have been too long unanswered. I have now great pleasure in sending you, herewith, my views on the points noted. * * * Pray excuse me for the delay in writing. I am, sir, Your obliged and obedient servant, WILLIAM BOYLE. LAND DRAINAGE--REPLIES TO QUERIES, ETC.