728 

 TABLE 2. 



lonisation L^ lonisation 



Number Depth in cm. Number Depth in cm. 



time in sec. time m sec. 



method sample 1913 showed a stronger radio-activity than the B'ango. 

 The two other samples, however, could again be ranged under the 

 order of 10—^2 giammes of radium pro gramme. 



But also photographically these and other samples were investigated 



