a Mixture of Carbonic Acid and Nitrogen. 443 



The constants R, K, a 3 @ were calculated by the method of 

 least squares, taking into account all the measurements given 

 by Andrews, altogether 48 in number. Their values actually 

 found by me were a little different from those given by 

 Margules, which latter are : — 



R=0'003674, K = 0-953, 



c, =0-0014, 



/3=0-00015. 



But when I compared the values of pressure calculated with 

 my values of the constants with the above corrected values, I 

 found that Margules'' values are on the whole rather preferable 

 to mine, so that, to avoid useless diversities, I determined to 

 adopt Margules' values throughout the following pages. 



The following Table contains, besides the corrected results 

 of Andrews's measurements, the calculated values of pressure 

 according to equation (1) with the above values of the con- 

 stants ; it contains all data that are wanted to get isothermals, 

 isomerics, and isopiestics of the mixture. It will be seen how 

 well equation (1) represents the results of measurements, and 

 so all that is possibly contained in it may as reasonably be 

 accepted as the measurements themselves. 



Table I. 



t. 



v. 



p (obs.). 



p (calc). 



Diff. 



o 





aim. 



atm. 





2-32 



0-02138 



43-30 



43-16 



-014 



2-34 



0-01805 



50-36 



50-31 



-0-05 



2-08 



0-01681 



53-54 



53-54 



000 



2-38 



0-01575 



56-87 



56-82 



-0-05 



2-06 



001455 



6088 



60-83 



-005 



210 



0-01338 



65-45 



65-44 



-0 01 



2-16 



0-01229 



70-47 



70 45 



-0-02 



221 



0-00998 



84-08 



84-10 



+0-02 



2-21 



00881 



93-40 



93-32 



-0-08 



2-17 



0-00772 



104-23 



10405 



-0-18 



22 L 



000668 



117-46 



117-27 



-019 



225 



000568 



13501 



13441 



-0-60 



