Ratio between Uranium and Radium in, Minerals. 655 

 Table II. 







Leak (divisions pe 



r 1 ruin.). 



Leak per 1 min. per 1 milli- 

 gram Uranium. 



Specimen. 



Uranium 

 (milligrms). 





























•308 



A. 



2028 



B. 



C. 



3-99 



A. 



B. 



0. 



[St. I 



65 83 





[12-98] 



\St, II 



1-49 







19-72 



20-88 





13-23 



14-23 



gS ] St. Ill 



•696 





9-56 



983 





13-74 



14-14 



rg j St. IV 



6-66 





86-80 







1302 





S I Sf. V 



•J 49 



9-70 





1-80 



65 ib 





[12-10] 



; 3 ] st. vi 



•74 







9-75 



10-01 





13-23 



13-53 



! *3 



PI 



•395 

 •171 



2355 



4-91 

 2-25 



5-02 



59-62 



12-43 

 13-16 



12 71 



£/ 



J.P.A 



JJ.P.B 



•3539 





4-66 



500 





13-17 



14-13 



G.E.A.P. ... 



•6534 



49-64 



10-39 



10-56 



7597 



15-90 



[12-54] 

 14-17 



14-43 



16-16 



[13-07] 

 14-77 



14-62 



RT 



•2077 



14-80 



261 



2-71 



71-25 





RII 



1-0066 



7220 



14-25 



14-85 



71-78 

 67-44 







(ThI 



•6103 



41-i6 



8-81 



8-93 



m J 



Thla 



3-027 





43-65 



43-64 





14-42 



14-41 



g-s 



Thlb 



1-926 







27-88 







14-47 



^* TiiX,(l)... 



8-4103 





111-5 







1325 





£o ThX 2 (2)... 



103 







13-91 







13-51 



3 ThOCC ... 



•3475 





4-56 



4-68 





1314 



13-46 



ThE 



3-168 







41-64 



29-1 



28-5 





13-14 



*J 



A I 



•834 

 •92 



24-28 



26 22 



512 

 4-42 





6-14 



4-80 





All 



= is J AAI 



S?5 [AAII . ... 



•568 



26-18 



5-33 





461 



9-39 





1-69 





16-29 







9-63 





t* ABI 



•562 



16-24 



3-29 





28-9 



5-85 





Qj ^ ST 



2-531 







8-43 







3-33 





AD 



1-265 







12-92 





_1 



10-22 

 8-90 







Pilbarite... 



1-359 







12-10 



Discussion of JRe suits. — In interpreting- the results of 

 Table II. it must be remembered that the determinations 

 have not all equal weight. The specimens on which the 

 A series of measurements was performed contained as a rule 

 too small quantities of radium to give the best results with 

 the less sensitive electroscope and method employed in the 

 B and C series. The measurements of Table II. enclosed in 

 square brackets may be at once eliminated from further con- 

 sideration on this account. In addition many of the solutions 

 had been prepared a considerable time, and may have 

 undergone changes by keeping. Three months elapsed 

 between the measurements in the B and series, and it is 

 evident from the Table that the sensitiveness of the instrument 

 had somewhat increased in the interval, as has been observed 

 before with the old instrument. 



