468 



Dr. C. R. A. Wright and Mr. C. Thompson. [Mar. 28, 



(6.) When the tin percentages in the lighter alloy are plotted as 

 abscissae and the lead percentages as ordinates. 



(c.) When the tin percentages in the heavier alloy are plotted as 

 abscissae and excesses of the percentage (+ or ) in the lighter alloy 

 over those in the heavier one as ordinates. 



These three curves respectively represent approximately the solu- 

 bility of zinc in lead containing tin and that of lead in zinc containing 

 tin, and the relative distribution of tin in the two alloys formed 



simultaneously. Fig. 1 represents the two curves of the first kind 

 plotted respectively from Series I and Series II, the continuous line 



