656 Miss Ruth Pirret and Mr. F. Soddy on the 



The first thing is to reduce the three series of measurements 

 given in the last three columns o£ Table II. to a common 

 standard. This has been done by taking first the mean value 

 in each of the three series for each of the minerals, except 

 the autunites, and then taking the mean of these means. The 

 result is, in divisions per milligram of uranium : — 



A 68-00, B 13-79, C 14-24. 



Hence to reduce all the determinations to the same standard 

 as the series, the A series must be multiplied by the factor 

 0*212, and the B series bv 1*033. This has been done in 

 Table III. 



Table III. 





Divisions per milligram of Uranium 

 (reduced values). 



A (cor.). B (cor.). C. 



Means. 



St, I 



13-95 



13*82 

 12 64 



13-66 



14-18 



14*23 

 14-14 



i 

 I 

 y 1385 



12-72 

 1 13-77 



St. II 



St. Ill 



St. IV 



13-44 



13 : 66 - 13 : 53 



12-82 12-71 



13-58 



1359 14-13 



St. V 



St. VI < 



PI 



J.P.A 



J.P.B 



G.E.A.P 



1610 



16-41 16-16 



16-22 



K I 



15-10 

 1520 



14-62 



14-7*7 



j 14-90 



RII 





ThI 



14-32 



14-89 

 14-88 



13-68 



13 : 56 



14-62 

 14-41 



I 14-60 



Thla 





ThI6 



14-47 





ThX 2 (l) 



13-51 



13-46 

 13-14 



I 13-55 



ThX, (2) 



ThCCC 



ThE 





AI 



6-20 



6-32 

 4-96 

 9-68 

 9-94 

 6-03 



'*3-33 

 10-22 



y 7-i5 



1 



J 



All 



605 

 9-80 



"tH2 



AAI 



AAII 



ABI 



ASI 



AD 



Pilbarite 







8-90 











