723 



The results obtained are comniiinicated in the subjoined table. 



TABLE 1. 



Indication 



of the 



samples 



Soil 



Depth in 

 Metres 



Radio-activity ex- 

 pressed in 10— '2gr. 

 rad. pr. gr. 



boring 2 



« 4 



„ 6 



„ 8 



n 10 



„ H 



„ 12 



„ 13 



„ n 



„ 20 

 „ 23 j 

 „ 231 

 A 

 B 

 C 

 D 

 M 

 W 

 R 

 mould 

 No. I 

 No. II 

 No. Ill 



lightgrey mud with remains of peat 



grey mud and dark clay 



grey-black clay 



blue-black clay 



black fat clay 



black mud 



bluish-grey claywith grains of sand 



blue-black clay 



black clay with remains of peat . 



sand with little slime 



light-grey clay 



sand 



brown-black peaty mud 



clay 



sand of the dunes 



light-grey clay 



slime of the Meuse .... 



slime of the Waal 



brown organic mud.... 



blue-black clay 



brown-grey clay . . . 



blue-black clay 



Fango of Battaglia. 



2.70 



4.40 



6.05 



7.40 



8.30 



9.30 



9.55 



10.50 



12.90 



+ .13.50 



21.20 



24.80 



0.40 



1.50 

 0.60 

 1.50 



0.43 

 0.54 

 0.55 

 0.61 

 0.78 

 0.66 

 0.62 

 (2.16) 

 0.64 

 0.1 

 0.75 

 I 0.36 

 j 0.37 

 0.39 

 0.78 

 0.23 

 0.59 

 1.09 

 1.49 

 0.24 

 0.96 

 0.61 

 0.49 

 0.57 

 34.0 



stronger than the substaftce investigated. The first calculation is preferable as in 

 it the ionisations could be examined over a larger number i.e. over 150 scale- 

 divisions. Even then the second calculation could be applied, if also the natural 

 leak had been examined down to 600. This, however, is difficult in connection 

 with the length of time of observation, if one makes several and very accurate 

 observations. 



