( 742 ) 



§ 2. Results for [Wa 



The subjoined table contains the results of the determinations in 

 the same way as table I of Comm. N°. 102''. 



The corresponding values for i)VA,d — o are: 



for — 252°.72 pvA = 0.07455 



for — 258°.82 



jpvA = 0.05222 



§ 3. FurtJier results. The number of points on every isotherm is 

 too small, and the densities are too large to allow already now the 

 derivation of the first individual virial coefficients of the polynomial 

 of state (cf. § 4 of Comm. N°. 102"). If, however, we give a graphical 

 representation, it shows that the isotherm pvA foi' — 259° must 

 exhibit a minimum and hence i?.i must be negative at this temperature. 

 Further follows from the isotherm of — 253°, that the intersection 

 of this line with the axis (/ ^ lies near the BoYLK-point. Probably 

 Ba is also already negative at — 253° though only slightly. All 

 this agrees very well with what was derived in § 5 of Comm. 

 N". 102^^, and speaks for the validity of the extrapolation applied 

 there with a view to the calculation of the critical temperature of 

 the helium. 



In conclusion I gladly express my thanks to Mr. C. Braak for his 

 assistance in this investigation. 



