( '••■'2 ) 



course of (lie plaitpoinl oleiiicuts, I shall f;ivc here the results of a 

 coinputatiou uhicii 1 have executed for CO^ and ll,. 



.V = (pure CO J T,,,i = 304,1 />,./,/ = 72,9 



0,1 295,8 90,8 



0,2 287,4 108,7 



0,3 274,8 124,8 



0,4 2(50,4 140,0 



0,5 244,3 153,9 



0,6 222,1 162,9 



0,7 " 194,0 164,5 



0,8 157,0 152,5 



0,9 108,8 115,2 



,i- = l (pure HJ 38,5 20 



The course of the jtlaitpoint line resulting from tiiis agrees with 

 fig. 9, plate I of Hartman's Thesis for the doctorate ; in reality, 

 however, the maximum of the plaitpoint pressure will lie much higher. 



Physics. — "Appendix to Communication N". 81". (Proceedings 

 June 28 and September 27, 1902) and Supplement N". 7 

 (Proceedings Oct. 31, 1903). By Dr. .J. E. Verschaffelt. 

 Supplement N". 12 to the Communications of the Physical 

 Laboratory at Leiden. (Communicated by Prof. H. Kameri.ingh 

 Onnes). 



(Communicated in the meeting of January 'il , 1906). 



In the expression which 1 have given before (Comm. N". 81 and 

 also Suppl. N". 7) for the function i|' in the neighbourhood of the 

 plaitpoint an inaccuracy has remained. I have found that I iiave 

 neglected therein more than a mere linear function of .c. 



If we write: 



V 



*=ƒ; 



pdv -\- tpj',' 



where T' represents a very large volume, then i|'(- is the free energy 

 in the perfect gaseous state, with the exception of an error which 

 will bv smaller as V itself becomes larger, and which vanishes 

 when we put T^oc. 



Tlie first term of i|', wiiich depends on v, may be dissolved in the 

 following way ; 



