Periodicity of the Spontaneous Ionization of Air, etc, 275 



the whole. On comparing corresponding curves in figs. 6 to 

 10, it will be seen that the general forms o£ the curves are 

 the same and that the maxima and minima correspond verv 

 closely. In order to make it quite clear that this does not 



Fisr. 9. 



QAtmo. PH£R/C Por&vr/At. CUffl/£ '.. tj'VNC /SO: 



X/aveZT/a/v Co.ri/s ^j/vf/906 



Fijr. 10. 



depend on the drawing of the curves, a table is given of the 

 times at which actual maxima and minima points were 

 observed. The times at which corresponding maxima and 

 minima occurred are placed alongside one another in the 

 same vertical column, the times for the atmospheric potential 

 curves being always placed first. 



