. Un cours de six conférences sur l'histoire chimique d'une bougie [ressource électronique]: Auquel s'ajoute, une conférence sur le platine. Ainsi. M. Anderson va me donner un remorqueur de notre réservoir d'oxygène, et j'ai beaucoup à faire pour l'appliquer à cette flamme, que je fais volontairement mal brûler sur le but. Therecomes l'oxygène: Ce qu'une combustion thatmace! Mais si je l'arrête, qu'est-ce qui devient de la lampe ? [Le flux d'oxygène a été arrêté, et la lampe a rechuté à son ancienne bosselage.]c'est merveilleux comment, au moyen de l'oxygène, la combustion de gélification a accéléré. Mais il ne notaiFect simplement la combustion de l'hydrogène, orcar

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. A course of six lectures on the chemical history of a candle [electronic resource]: to which is added, a lecture on platinum. so. Mr. Anderson will give me a tubecoming from our oxygen-reservoir, and I amabout to apply it to this flame, which I willpreviously make burn badly on purpose. Therecomes the oxygen: what a combustion thatmakes! But if I shut it off, what becomes ofthe lamp ? [The flow of oxygen was stopped, and the lamp relapsed to its former dimness.]It is wonderful how, by means of oxygen, weget combustion accelerated. But it does notaiFect merely the combustion of hydrogen, orcarbon, or the candle; but it exalts all com-bustions of the common kind. We will take IRON WIRE BURNED IN OXYGEN. 105 one which relates to iron, for instance, as youhave already seen iron burn a little in theatmosphere. Here is a jar of oxygen, and thisis a piece of iron wire; but if it were a bar asthick as my wrist, it would burn the same. Ifirst attach a little piece of wood to the iron, Ithen set the wood on fire, and let them bothdown together into the jar. The wood is nowalight, and there it burns as wood should burn. Fi?. 23. in oxygen; but it will soon communicate itscombustion to the iron. The iron is now burn-ing brilliantly, and will continue so for a longtime. As long as we supply oxygen, so longcan we carry on the combustion of the iron, until the latter is consumed. We will now put that on one side, and takesome other substance; but we must limit ourexperiments, for we have not time to spare for 106 SULPHUR BURNING IN OXYGEN. all the illustrations you would have a right toif we had more time. We will take a piece ofsulphur: you know how sulphur burns in theair; well, we put it into the oxygen, and youwill see that whatever can burn in air can burnwith a far greater intensity in oxygen, leadingyou to think that perhaps the atmosphere itselfowes all its power of combustion to this gas.

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