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TWO:��But��are they?�� He pulled a wire out a trifle from the sheath.Chemistry also received valuable extensions of its field. Dr. John Mayow published new facts respecting nitre, and on the phenomena of respiration and combustion, as revealed by experiments on this and other substances. At the commencement of the eighteenth century Stahl, a German chemist, propounded his theory of phlogiston as the principle of combustion, which was only exploded by the further discoveries of Dr. Black, Cavendish, and Priestley. Soon after, Dr. Hales threw new light on a?riform bodies, or, as they are now termed, gases; and finally, Dr. Black demonstrated the presence of a gas in magnesia, lime, and the alkalies, which had long before been noticed by Van Helmont, but had been forgotten. This was then termed fixed air, but has now acquired the name of carbonic acid gas, or carbon dioxide. At the end of this period chemistry was extensively studied, and was rapidly revealing its secrets. TWO:His plan for his chef-d'?uvre, St. Paul's, like his grand plan for the City, with its principal streets ninety feet wide, its second-rate streets sixty, and its third-rate thirty, was rejected. This cathedral was a composition compact and simple, consisting of a single general octagonal mass, surmounted by a dome, and extended on its west side by a portico, and a short nave or vestibule within. The great idea of Wren was to adapt it to Protestant worship, and therefore he produced a design for the interior, the parts of which were beautifully grouped together so as to produce at once regularity and intricacy, yet without those long side aisles and recesses, which the processions and confessionals of Roman Catholic worship require. The whole long period of Wren's erection of this noble pile was one continued battle with the conceit, ignorance, and dogmatism of the commissioners, who made his life a bitter martyrdom; and when we read the admired inscription in St. Paul's, "Si monumentum requiris, circumspice," we behold, on obeying its injunction, only what Wren did, not what he suffered in doing it.��Now,�� he said, as Dick, last to crawl in, cleared the edge of the metal, ��see how clever this is��the inside of the two plates it has to come down against are fixed with something soft��I think it��s felt��to keep the plate from clanging. It fits so well that the only way I found out about it was by the sun making the dent in the paint show up a few little bright worn spots of bare metal.�� TWO:"He told him the truth, I tell you: that when we heard the Apaches were coming, we lit out and drove out the stock from the corrals. I don't recollect his words."��What is it?�� eagerly. Sandy wanted details. TWO: