NATURE OF THE LARGE IONS IN THE AIR. 



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The whole evidence is now graphically shown in the figure. 

 From the diagram it is seen that the observations, irres- 

 pective of temperature, when plotted against the relative 

 humidities approximately follow a curve, which, from con- 

 siderations of relative weight, has been drawn through the 

 mean values of the grouped measures previously given. 

 Although the observations are not as accordant as could 

 be wished, still it is sufficiently evident that a definite 

 relation exists between the mobility of the large ions and 

 the humidity of the air, the form of which is, at least, 

 indicated by the given curve. 



The determination of this fact furnishes a partial clue to 

 the nature of the ion, but before considering it I wish to 

 refer to further experimental results which afford evidence 



