Dr. Arnott, the worthy successor of Count Rumford[41] in _heat philosophy_, when seeking to shame us out of using ill-contrived fireplaces and scientific bunglings, tells us that the savages of North America place fire in the middle of the floor of their huts, and sit around in the smoke, for which there is escape only in the one opening in the hut, which serves as chimney, window, and door. Some of the peasantry in remote parts of Ireland and Scotland still place their fires in the middle of their floors, and, for the escape of the smoke, leave only a small opening in the roof, often not directly over the fire. In Italy and Spain, almost the only fires seen in sitting-rooms are large dishes of live charcoal, or braziers, placed in the middle, with the inmates sitting around, and having to breathe the noxious carbonic-acid gas which ascends from the fire, and mixes with the air in the room; there being no chimney, the ventilation of the room is imperfectly accomplished by the windows and doors. The difference between the burned air from a charcoal fire, and smoke from a fire of coal or wood, is that in the latter there are added to the chief ingredient, carbonic acid, which is little perceived, others which disagreeably affect the eyes and nose, and so force attention. With these facts before us, it is not difficult to imagine how our ancestors tolerated the nuisance of wood smoke filling their rooms till it found its way through the roof lantern, as was generally the case until the general introduction of chimneys late in the reign of Elizabeth. It should, however, be mentioned that the temperature of their apartments was kept considerably below that of our sitting-rooms in the present day. Before the fourteenth century, except for culinary and smithery purposes, robust Englishmen appear to have cared little about heating their dwellings, and to have dispensed with it altogether during the warmer months of the year. Even so late as the reign of Henry VIII. it seems that no fire was allowed in the University of Oxford: after supping at eight o'clock, the students went to their books till nine in winter, and then took a run for half an hour to warm themselves previously to going to bed. Therefore, all ideas of the firesides of our forefathers should be confined to four centuries. The usage of making the fire in the middle of the hall, a lover of olden architecture says, "was not without its advantages: not only was a greater amount of heat obtained, but the warmth became more generally diffused, which, when we consider the size of the hall, was a matter of some importance. The huge logs were piled upon the andirons or thrown upon the hearth, and the use of wood and charcoal had few of those inconveniences which would have resulted from coal;" an opinion strangely at variance with that of the heat philosopher already quoted.