"I thank you for the many and judicious observations about my bridge. I am exactly in your Ideas as you will perceive by the following account.--I went to the Iron Works the latter end of Octr. My intention at the time of writing to you was to construct an experiment arch of 250 feet, but in the first place, the season was too far advanced to work out of doors and an arch of that extent could not be worked within doors, and nextly, there was a prospect of a real Bridge being wanted on the spot of 90 feet extent. The person who appeared disposed to erect a Bridge is Mr. Foljambe nephew to the late Sir George Saville, and member in the last Parliament for Yorkshire. He lives about three miles from the works, and the River Don runs in front of his house, over which there is an old ill constructed Bridge which he wants to remove. These circumstances determined me to begin an arch of 90 feet with an elevation of 5 feet. This extent I could manage within doors by working half the arch at a time.... A great part of our time, as you will naturally suppose was taken up in preparations, but after we began to work we went on rapidly, and that without any mistake, or anything to alter or amend. The foreman of the works is a Relation to the Proprietors, an excellent mechanic and who fell into all my Ideas with great ease and penetration. I staid at the works till one half the Rib, 45 feet, was compleated and framed horizontally together and came up to London at the meeting of Parliament on the 4th of December. The foreman, whom, as I told him, I should appoint 'President of the Board of Works,' in my absence wrote me word that he has got the other half together with much less trouble than the first. He is now preparing for erecting and I for returning. "February 26.--A few days ago I received a letter from Mr. Foljambe in which he says: I saw the Rib of your Bridge. In point of elegance and beauty, it far exceeded my expectations and is certainly beyond any thing I ever saw.'--My model and myself had many visitors while I was at the works. A few days after I got there, Lord Fitz-William, heir to the Marquis of Rockingham, came with Mr. Burke. The former gave the workmen five guineas and invited me to Wentworth House, a few miles distant from the works, where I went, and staid a few days. "This Bridge I expect will bring forth something greater, but in the meantime I feel like a Bird from its nest and wishing most anxiously to return. Therefore, as soon as I can bring any thing to bear, I shall dispose of the contract and bid adieu. I can very truly say that my mind is not at home.