. The Philosophical magazine; a journal of theoretical, experimental and applied physics. ed platinum disintegrated much more readily than un-charged or ])ositively charged platinum. When the tube was placed in a bell-jar, filled with one ofthose gases which conduct electi-icity well, such as hydro-chloric-acid gas, it made but little difference to the currentwhether the top or bottom electrode was negative, though onadmitting the air this difference was at once detected. Thisindicates, I think, that the main part of the current throughair is carried in a different way from that in which it is
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. ed platinum disintegrated much more readily than un-charged or ])ositively charged platinum. When the tube was placed in a bell-jar, filled with one ofthose gases which conduct electi-icity well, such as hydro-chloric-acid gas, it made but little difference to the currentwhether the top or bottom electrode was negative, though onadmitting the air this difference was at once detected. Thisindicates, I think, that the main part of the current throughair is carried in a different way from that in which it iscarried through one of the better conducting gases. Laios of Conduction through Hot is known that the conduction through hot air does notobey Ohms law (Blondlot, Journal de Physique, 2 serie, t. 1887). The following experiments, although theycannot lay claim to any Aery great accuracy, show that theconduction through those gases which conduct electricitywell does not depart very nuich from Ohms law. Tlie greatdifficulty in these experiments is to keep the tcmpeiature. of Electricity throx(gh Hot Gases. 443 constant. I Ibnnd it impossible to do this for any lengthof time, and so endeavoured to make the expeiiments asquickly as possible. For this purpose a series of small storage-cells were arranged within easy reach of the observer, andconnected in such a way that the number of cells in theciriuit could be altered by lifting a wire from one mercurycuj) and ])ntting it in another. The following are the resultsolttaincd in this way with hydrochloric-acid gas at a yellowheat, tlie observations made within a short time of each otherbeing enclosed in brackets :— Number of Cells. Deflexion. 35 13 35 13 45 35 20 3581 35\ 4j 20j These experiments seem to indicate that these gases obeyOhms law. Influence of the Temperature of the Electrode on the Passageof Electricity through Hot condition of the electrodes exerts a most powerfulinfluence on the passage of e
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