534 



Dr. C. R. Alder Wright. 



Feb. 2, 



Cd. 

 Pb 2 



Calculated. 

 21-3 



78-7 



Found. 



100-0 



22 



76 



98 



22-4 



77-6 



100-0 



Obviously, this configuration strongly suggests that a definite 

 atomic compound Pb 2 Cd exists, the tendency towards the forma- 

 tion of which is the cause of the convergence together of the tie lines ; 

 as in the analogous case with lead-zinc-tin alloys (Part V), where a 

 similar convergence suggests the existence of the definite compound 

 SnZn 4 . 



Some observations were made at temperatures a little higher than 

 those employed in the foregoing experiments, the result of which 

 was to indicate that the critical curve is somewhat rapidl}' lowered in 

 position with a raised temperature, at any rate, as regards its upper- 

 most portion. Thus, at temperatures ranging between 600 and 700, 

 and averaging about 650, or some 50 higher than before, it was 

 found that no separation at all took place with a mixture containing 



