/9 Rays from Radium by Solutions and Liquids. 609 



liquids in the two cells were separated by a sheet of mica 

 *01 mm. thick. The amount o£ liquid in each cell was 

 determined by weighing. 



The cells arranged as described above were placed under 

 the electroscope over the radium, and the activity of the 

 beam of /3 particles passing through both liquids was 

 measured by the ionization in the electroscope. 



After ten concordant observations had been taken, the 

 thin sheet of mica was carefully removed without changing 

 the position of the cells, and laid on the top of the upper 

 cell. Then the liquids were mixed and the activity of the 

 /3 rays passing through the mixture was again measured. 



In no case was air allowed to enter the cells or any liquid 

 allowed to escape. 



The results of several experiments of this kind are given 

 below in Table A. The activity (I) of the pencil of /3 

 and y rays passing through both empty glass cells with mica 

 between them was taken as 100; the y ray activity was 12. 

 In Table A given below, the upper line gives the weight 

 of the liquid in the upper cell and the lower the weight of 

 the liquid in the lower cell. On the right-hand side are 

 given the physical or chemical results of the mixture. The 

 percentage activity observed in each case after the ft rays 

 had passed through the solution is represented by I. 



Table A. 



Not mixed. 



II. 



III. 



IV. 



•92 gr. H 2 SQ 4 (12-4 percent.) 

 •51 gr. H 2 



r per cent. 



H 2 SQ 4 (20-4 p. 

 >50"gr. H 2 



[ p.c. 



H 2 SQ 4 (39-2 p. 

 50 gr. H.O 

 > p.c. 



sugar solution 

 H)40 gr. H 2 

 I = 19-25 p.c. 



1-51 gr 



H 2 Q 



I = 20-67 per cent. 



1-030 gr. H.,SO 



, (20-4 p.c.) 



1050 gr. 



H 2 



I = 2014 p.c. 





1160 gr. H 2 SO. 



, (39-2 p.c.) 



1050 gr. 



HO 



I = 1909 p.c. 





1*150 gr. sugar 



solution 631 p.c. 



100 gr. CaCl 2 solution 



V * ' 114 gr. H 2 S0 4 



I = 19-42 p.c. 



^AgJSO* solut. 

 VI. Equiv-^j-^- 



I = 21-43 p.c. 

 Phil. Mag. S. 6. Vol. 19. 



Mixed. 

 The mixture contained : 



45 per cent. H 2 S0 4 



I = 2051 per cent. 

 10- 1 p.c. H 2 S0 4 



I = 2009 p.c. 

 20-6 p.c. H 2 S0 4 



I = 19-13 p.c. 

 33-2 p.c. sugar solution. 



I = 1911 p.c. 

 Difference = — '73 p.c. 

 = precip. CaS0 4 4- 2H CI 4- aq. 



I = 19-48 p.c. 



= precip. 2AgCl4-prec. BaS0 4 +aq. 



I = 21-47 p.c. 



No. 112. April 1910. 2 R 



