1st.—Mr. Hosking having suggested “a modified copy of the Pantheon,” a massive building for the exhibition of sculpture, with no accommodation for readers or books, now claims the merit of the structure which I suggested, and which has been built, was intended, and is used, solely, for readers and for books. His scheme included quadrilateral halls, central halls, ample staircases, corridors, &c., all of the usual materials; the building which I suggested and have seen carried out, is original in plan, use of materials, arrangement, and construction. Mr. Hosking says that it is not the plan of the Pantheon that he claims, “but the application of its form, disposition, and proportions;” and the plagiarism he alleges, is the application of such his device, with certain of his combinations, contrary to honour and good faith, not only on my part, but also on that of the Trustees. It will be obvious to any one who will inspect the building, that neither the form, nor the disposition, nor the proportions of the Pantheon, have been adopted in the new building at the Museum. There is no resemblance whatever between the architectural features of the two schemes. Mr. Hosking proposed a reduced Pantheon,—a cupola 120 feet in height, and the same in diameter. The cupola of the Reading-Room is 140 feet in diameter, and 106 feet in height. Are these two conceptions alike? 2nd.—Mr. Hosking says that I am a “pirate,” having taken from his scheme my suggestions for building the Reading-Room and surrounding Libraries; which suggestions I made on the 5th of May, 1852. Instead of using hard words and dealing in generalities, it would be better that Mr. Hosking should declare specifically which of his suggestions have been adopted in the new building. I affirm none, not even the most trifling. Indeed such an appropriation was impossible, as I am going to prove. Mr. Hosking states that, on the 14th of June, 1852, he sent me a copy of that portion of the _Builder_, dated June 22, 1850, in which his scheme of building was set forth. I distinctly aver that I did not receive that portion of the _Builder_ on the 14th of June, 1852, nor in any part of 1852 or 1853, and that I never knew of Mr. Hosking’s plan till the latter part of 1854, when I did see, for the first time, the extract from the _Builder_ of the 22nd of June, 1850.