and the Weston Normal Cell. 259 



Table III. 



Criving the observed E.M.F/s at 0° C. of cells containing 

 from 2 to 20 per cent, of cadmium in the amalgams. 

 Observed E.M.F.'s = 1-01840 int. volts + diffs. in hundred- 

 thousandths of a volt. 



Percentage of 

 Cadmium in 

 (he AmaLqram. 



2 



-365 



3 



+35 



4 



34 



5 



35 



6 



35 



7 



36 



8 



36 



9 



36 



10 



36 



10-5 



37 



11 



37 



11-5 



39 



12 



40 



125 



41 



13 



47 



135 



50 



14 



249 



145 



457 



15 



673 



16 



560 



17 



1101 



18 



1295 



19 



1564 



20 



1613 



0°C. 

 5.11.190S. 





o 5 



M 



o°c. 



6.2.1909. 



-368 



35 



35 



35 



35 



36 



36 



36 



36 



36 



36 



38 



36 



39 



40 



40 



3S 



48 



443 



163 



1006 



1260 



1493 



1611 



0° C. 

 27.2.09. 



-368 



35 



35 



35 



35 



36 



37 



36 



36 



36 



36 



37 



36 



38 



40 



38 



49 



58 



567 



179 



1042 



12«6 



1498 



1616 



0°C. 

 20.3.09. 



Max. 

 difference. 



-368 I 



34 



35 



35 



36 



36 



36 



37 



37 



37 



37 



37 



39 



38 



40 



41 



8Q 



216 



626 



A 98 



10-19 



1266 



1507 



1617 



1 

 1 

 

 1 

 

 1 

 1 

 1 

 1 

 1 

 2 



4 



3 



7 



12 



211 



409 



230 



397 



95 



35 



71 



4 



values are considerably lower than the original values. The 

 only cell dealt with in Table II. which had practically the same 

 initial and final values at 0° C. (see Table III.) is the 20 per 

 cent, amalgam cell, and this also is the only cell which was 

 practically constant in E.M.F. when any temperature from 

 0° to 45° C. was maintained constant. 



The graphs which result on plotting the values of the 

 percentages of cadmium and the corresponding E.M.F.'s at 

 various temperatures, are shown in fig. 2 (PI. III.)*. For the 

 purpose of the figure the final values of the E.M.F/s given 

 in Table II. were chosen. The lower ascending portion of a 

 curve is taken to indicate that the amalgam is completely 

 liquid ; the nearly horizontal portion indicates that a two- 

 phase system — part solid and part liquid — is present, and the 



* In some cases the plotted values lie at considerable distances from 

 the corresponding- curves. 



S 2 



