596 ) 



If also in the second iiiembei- of the equations (1) we put ./■ snial 

 we may integrate the hitler to 



_ r,_^^. y— _ 9 — \-^^ -^ '/A + constant . . (2) 



From this equation we may easily derive the value of -cy),/ if the 

 mean composition A', the height of the tuhe H and the place where 

 the meniscus appears are given, and hence also .t'y),/ — X, if tliis 

 takes place just at the top or at the bottom of the tube. Let Tx>ii 

 be the plaitpoint temperature belonging to the composition A', T/,^,/ the 

 temperature at which the meniscus appears just at the top of the 

 tube, T„.^A the same for the bottom of tlie tube, then we oinain -. 





ch 

 V IT 



and for To.pi tlie same formula with the other sign. 



If as in Comm. N". 75, § 2 we introduce the law of corre- 

 sponding states this formula becomes : 



pkVk 



c. 



where for — '- — we still could substitute the form given in Comm. 

 d.v 



K". 75 equation '2(1. 



§ 4. In the comparison of formula (3) with the observations 

 mentioned in § 2 1 have assumed that for the area of the plait- 

 points the law of corresponding states holds to the first approximation, 

 and I have taken for a and (i the values derived from the obser\ations 

 of the plaitpoints (comp. this Comm. V, § 8). 



i'or T — r I have taken the value — 5.3 calculated by versgHxVFFELT 



\doyy 

 (Comm. Suppl. N". B, Proc. .lune 1903, p. 121) from the series of Kamkr- 



LiNGH Onnes, which value with 6',=3.45 ') gives TJ — ^ J = — 218 -') . 



With the value H z= 5.8 cm., and the critical density for carlxm dioxide 



1) Comp. this Comm. IV, p. 577. 



-) Comp. Comm. N^ 75„ Proc. Dec. I'JOl, p. 307. 



