B(i3 



7' loc, p = A^B{ T- 7',) + 6 ( 7 - 1\Y 

 where .-1 = 190.86, /^ = 3.9649, C'= 0.00100 for p \\\ int. alm. 

 This equation is again due to tiie kindness of Prof Verschaffelt. 



Table V gives the eompai'ison between observation and calculation. 



For 7'=i8r.87 K. the e(|uation gives /^=: 1.6363 (Crommelin), 

 whereas p = 1.6584 (Cath) 



is found from (he equation which represents my observations. The 



difference between these two values (corresponding to A 7V>-Co = -10 

 of a degree) is so large, that for the present it seems impossible to 

 combine the observations above the boiling point with those below 

 it in one and the same equation. 



satisfies the condition of givhig the correct critical pressure al the critical point. 

 The present formula gives p^ = 32.728 atm. instead of the observed value p. = 33.49. 



