540 



Dr. C. R. Alder Wright. 



A. B. 



Antimony 28'5 30'8 



Lead...' ... 41-5 32-2 



Zinc . 30-0 37-0 



[Feb; 2, 



100-0 100-0 



By means of Stokes' first method the values for the limiting point 

 are deduced as being A-B = 4, C + C' = 53 ; whilst by means of 

 tlu- 2nd method the following values are found, A + A' = 75, B+ B' 

 = 72 ; leading to the final result 



1st Method. 2nd Method. Mean. 



Lead 38-75 37'5 38-1 



Zinc ., 34-75 36-0 35'4 



Antimony .. 26'50 26'5 26'5 



100-00 100-0 100-0 



This indicates a ratio between lead and zinc near to that repre- 

 sented by the formula PbZn 3 ; the corresponding ratios found with 

 tin, silver, and cadmium as solvent metals being respectively near to 

 rbZn 6 , Pb 2 Zn, and Pb 4 Zn. 



Mixtures of Bismuth, Zinc, and Antimony. 



The following average values were deduced from the examination 

 of twenty-eight compound ingots (fifty-six alloys) ; in the earliest 

 cases the ratio of zinc to bismuth was that of equality ; later it was 

 raised successively to 2 : 1 and 3 : 1, and finally to 7 : 2 : 



