c±o 



Prof. J. Jo] 



id Mr. A. L. Fletcher : 



due to ionium lies nearest io the centre, in air at about 

 2'1 cm., in bioiite at about 0*01 mm. After this the shells 

 of the several maxima crowd together, merging one into the 

 other, as the table of ranges, given above, shows. The com- 

 plex curve, given by Bragg and Kleeman for radium which 







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has developed emanation and the ensuing products of rapid 

 change, illustrates this effect; the line of ionization sloping, 

 with perturbations, upwards from right to left, the slope 

 ending with the effects due to RaA. In the halo we must 



