La Londres, Édimbourg et Dublin philosophical magazine et journal of science . il ismuch plus grande que lorsque le gaz est à l'état normal. De nombreuses expériences sur la relation entre l'currentthrough la modification du gaz et de la force électromotrice il actingupon ont été faites. Les tableaux suivants représentent les deux resultsof de telles expériences. Différence de potentiel en volts n entre le fil central et le cylindre ou le fil  +.. sur le fil -. 40 40 30 80 45 120 6Q 8070 160 107 80 200 122 97 400 150 126 600 200 139 800 220 138 1000 230 150 Ces résultats sont représentés graphiquement dans les courbes de la fig. 1. Ces

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The London, Edinburgh and Dublin philosophical magazine and journal of science . it ismuch greater than when the gas is in the normal state. Many experiments on the relation between the currentthrough the modified gas and the electromotive force actingupon it were made. The following tables embody the resultsof two such experiments. Potential-difference in volts n between the central wire Or and the cylinder. wire +. wire —. 40 40 30 80 6Q 45 120 80 70 160 107 80 200 122 97 400 150 126 600 200 139 800 220 138 1000 230 150 These results are represented graphically in the curves in fig. 1. These curves clearly show the approach to satura- tion. The following observations were taken with air of considerably smaller conductivity than that used in the preceding experiments :- Potential-difference in voltsbetween the central wire Current. and the cylinder. wire +• wire —. 40 18 17 80 2y 2S 120 36 36 200 58 55 400 80 78 600 92 85 800 105 95 1000 110 95 Induced-Radioactivity in Air, 359 Curves representing the results of these experiments areshown in fig. 1. Kff. 1.. 600 700 800 900 D/r££/?£A/C£ /TV VOLTS In these experiments the central electrode was not sup-ported by the ebonite plate at the centre of the lid of thevessel containing the modified gas, but was supported abovethe vessel and passed into the vessel through a hole in the lidwinch it did not touch. The air when in the modified state produced by bubblingthrough water can be transferred from one vessel to anotherand still retain some, at least, of its conductivity. To showthis a second vessel was prepared. This was a large galvanizediron cistern supported on insulating feet, a central wire placedalong its axis was kept connected with the electrometer, andthe current between this wire and the case of the cisternmeasured. This vessel, which we shall call B, was connectedby a metal pipe about 150 cm. long and 1 cm. in diameterwith the vessel A, in which the modified gas was stored.Wheu air was blown from A

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