Scientific amusements . ires thedraught supplies fresh air to the room with sufficientrapidity. But many seaside journeys might be avoided iffresh air were insisted on at home. There is another and an important constituent of theatmosphere called OzONE, which is very superior oxygen,or oxygen in what is termed the AUotropic state, andis distantly related to electricity, inasmuch as it can be pro-duced by an electrical discharge. This partly accounts forthe freshness in the air after a thunderstorm, for we are allconscious that the storm has cleared the air. The fresh,crisp ozone in the atmosph
Scientific amusements . ires thedraught supplies fresh air to the room with sufficientrapidity. But many seaside journeys might be avoided iffresh air were insisted on at home. There is another and an important constituent of theatmosphere called OzONE, which is very superior oxygen,or oxygen in what is termed the AUotropic state, andis distantly related to electricity, inasmuch as it can be pro-duced by an electrical discharge. This partly accounts forthe freshness in the air after a thunderstorm, for we are allconscious that the storm has cleared the air. The fresh,crisp ozone in the atmosphere is evident. Ozone differsfrom oxygen in possessing taste and smell, and it is heavierby one-half than the oxygen gas. There is a good dealof ozone in the sea breeze, and we can, though not infal- 6o CHEMISTRY. llbly, detect its presence by test-paper prepared withiodide of potassium, which, when ozone is present, willturn blue. We have still something to learn about ozone,which may be considered as condensed Development of gas by combustion. We have frequently mentioned combustion, and asunder ordinary circumstances siich effects cannot takeplace without , we will consider it. Com-bustion is chemical action accompanied by light and heat. COMBUSTION. 6l Chemical union is always attended by the development ofheat, not always by light, because the union varies in inten-sity and quickness. But when a candle is burning we canstudy all the interesting phenomena of combustion. Wehave elsewhere spoken of Heat and Light, so we needonly refer the readers to those subjects in the former partsof this series. Heat is referable to chemical action, andvaries according to the energy of union. Heat is alwayspresent, remember, in a greater or less degree ; and when
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