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THREE:Landor was in the dining room, and Felipa stood in the sitting room receiving the praises of her husband with much tact. If he were the hero of the hour, she was the heroine. The officers from far posts carried their admiration to extravagance, bewitched by the sphinx-riddle written somehow on her fair face, and which is the most potent and bewildering charm a woman can possess. When they went away, they sent her boxes of fresh tomatoes and celery and lemons, from points along the railroad, which was a highly acceptable and altogether delicate attention in the day and place.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.