Nolan and Enright — Experiments on Large tons in Air. lOl 



100° 0. might well be such as would make the mobility \'aiy as tiie square 

 root of the absolute temperature ; but our observations are not accurate 

 enough to decide. 



The curve for 125° C. shows that a more serious change has set in. The 

 number of ions is reduced, and saturation is now obtained at a voltage 

 corresponding to an ion of mobility '00066. The shape of the curve shows 

 that a considerable number of more mobile ions are present. At 140° C. the 

 ion of mobility 'OOOOG is still present, but the more mobile ions have 



increased in number, while at 167° C. the slowest ion present has a mobility 

 of -0020. It is evident that at temperatures above 100° C. the ion breaks 

 down. The new forms which appear seem to be identical, when allowance 

 is made for the change of temperature, with the ions of mobility "OOOG-S and 

 •0014 obtained from alcohol and '00064 and '0012 obtained from phosphorus 

 by McClelland and P. J. Nolan.' 



The fact that the disintegration of the ions begins about 100° C. seems at 

 first sight to be connected with the boiling-point of water. While there is 

 hardly any doubt that the ions are composed of water, it is difficult to see 



' McClelland and P. J. Nolan, Proc. Hoy. Irish Acad., vol. xxxiv, A, 1918, and 

 vol. X5XV, A, 1919. 



