And how the Library would add to the glory of the place, but, alas! it has been scattered far and wide, for in 1816, Thomas Dobson advertised the same for sale in a neatly printed pamphlet of 96 pages. In it were many scarce and valuable books. The appended prices ranged quite widely, reaching in one case the goodly sum of two hundred dollars! And as future chemists visit this unique reminder of Dr. Priestley it should be remembered that on the piazza of the dwelling house there assembled August 1, 1874, a group of men who planned then and there for the organization of the present American Chemical Society. The "Essays," previously mentioned, will be found intensely interesting but they are somewhat difficult to read because of their strange nomenclature. Here is Priestley's account of the method pursued by him to get nitrogen: Pure phlogisticated air (nitrogen) may be procured in the easiest and surest manner by the use of iron only--To do this I fill phials with turnings of malleable iron, and having filled them with water, pour it out, to admit the air of the atmosphere, and in six or seven hours it will be diminished ... what remains of the air in the phials will be the purest phlogisticated air (nitrogen). Among his contributions to the scientific periodicals of the times there was one relating to the sense of hearing. It is a curious story. One may properly ask whether the singular facts in it were not due to defects in Priestley's own organs of hearing. The paper did not arouse comment. It was so out of the ordinary experimental work which he was carrying forward with such genuine pleasure and intense vigour. Strong appeals were steadily coming from English friends that he return. While commenting on the pleasure he should have in seeing them he firmly declared that the step would not be wise. In short, despite all arguments he had determined to remain where I am for life. The prejudices against him were abating, although he said that many things are against me; and though they do not _shake_ my faith, they _try_ it. There had gathered a class of fourteen young men about him in the Northumberland home. They had adopted his Unitarian ideas. To them he lectured regularly on theology and philosophy. Those must have been inspiring moments. It was in this wise that the aged philosopher felt he was doing good and was most useful. He said that it was a pretty good class of young men to lecture to. Much time was given to his English correspondents. Them he advised of the rapid development of the States. He sent to some pictures of the country about him, and with much delight he referred to the fact that Jefferson, whom he ardently admired, was now, in the closing weeks of 1800, the President, and his associate--Aaron Burr, Vice-President. He announced to English friends that the late administration, that of John Adams, was almost universally reprobated.