632 



Lester — Radioactive Properties of the 



Table II. 



No. 



Material 



Equiv. Act. 

 grams U per 

 gram x 10 -10 



Grams Ra 

 x 10- 10 



Fusion 



Per gram 



Solution 



12 



Quartz sand and orthoclase 



0-474 





12 



Sand 



0-423 





13 



Mud and organic matter 



1-865 





27 



Limonite and calcareous sinter 



0-299 





27 



Limonite and calcareous clay 



0.141 





27 



Calcareous clay 



0-588 





27 



Calcareous clay 



0-907 



none 



28 



Mud and limonite 



1-328 





71 



Mud and muscovite 



0-251 





73-lb 



Clay 



16-88 



8-67 



73-2b 



Clay 



15-11 



3-62 



76b 



Sulphura 



8-74 



1-88 



77b 



Clay 



0-732 





77b 



Clay 



0-265 





108 



Sand 



0-349 





142 



Clay 



0-444 





147 



Carbonaceous clay 



1-245 





147 



Carbonaceous clay 



1-54 



0-291 



150 



Limonite and calcareous sinter 



20-73 





150 



Limonite and calcareous sinter 



9-36 





152 



Calcareous clay 



0-007 





153 



Calcareous clay 



0-263 





153-1 



Calcareous tufa 



0-527 





154 



Limonite and clay 



0-321 





158 



Calcareous sinter 



1-72 





175 



Calcareous sinter and clay 



1-14 



trace 



175 



Calcareous sinter and clay 



0-485 





177 



Tufa 



1-345 





182 



Limonite and clay 



0-639 





182 



Limonite and clay 



0-855 





183 



Limey clay 



0-724 





183 



Calcareous clay 



0-449 





184 



Calcareous clay 



0-603 





200 



Porous sinter and sulphur 



0161 





203 



Yellow sinter 



0-233 





203-1 



Tufa 



0-604 



0-085 



207 



Limonite and sand 



0-073 



trace 



207 



Limonite and sand 



0-273 



0-125 



235 





0-216 





238 



Calcareous clay 



0-123 





238 



Calcareous clay 



0-397 





238 



Mud 



0-057 





165 



Cave incrustation, sulphura 



trace 





165 



Eusty clay 



none 





3-21 

 2-07 



114 



a Sulphur pure enough to burn. 



b The springs 73-77 are peculiar. In addition to practically pure sulphur, 

 Schlundt (I. c.) finds that part of the sinter deposited by them is about 

 87 per cent barium sulphate. He also finds a sample of tufa from one 

 of these springs showing 14-8 X 10_10 gram Ra per gram. 



