524 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



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single equilibrium curves in 

 question, but have been influ- 

 enced by the behavior of the 

 two neighboring curves meeting 

 at the triple point. Some dis- 

 cussion of the way in which these 

 data were adjusted at the triple 

 points seems called for. 



The Triple Points. 



The equilibrium curves them- 

 selves were in all cases, except 

 one, accurate enough so that the 

 three curves met at the triple 

 point naturally, without the 

 slightest forcing. The one excep- 

 tion is the lower end of the V-L 

 curve, already mentioned, where 

 it seemed desirable to raise the 

 lower end by 0°.2. Even this 

 curve as thus raised is not actu- 

 ally inconsistent with the data. 

 The values of the co-ordinates of 

 the triple points are shown in 

 Table XXVIII. 



In selecting the best values 

 for the change of volume, the 

 greatest weight was attached to 

 the curve which was evidently 

 most self-consistent. The values 

 on the other two curves were then 

 so adjusted as to give consistent 

 results with the least violence 

 possible. The full details of the 

 process are shown in the table, 

 which gives the final values, and 

 in parentheses the values found 

 from the individual curves before 

 this process of adj ustment. The 

 signs are so chosen that the 

 change of volume is an increase 



