( 90 ) 



V V 



add to this 



—Ab 



- ^ 

 Lb 



1 



Lb 



1 1 



b, . nb. 



{nb,y 



, and (29'') reduces to; 



the sum becomes (see also p. 457 loc. cit.) 



log 

 Now : 



P + 



(nb,) 



1 



_ P 



«/i,2 n"cr/-K"-i)_ 



^0 



A ~^^ I p{—Lb)-q, 

 RTb,.nb., RT 



Po = 



A/> 



a 

 vr' 



— Lb />, . ;//> ' 



as before [see II p. '45, toniiula (10); These Proc. May 1909], when 



namely the coexistence curve solid-liquid is rdrogressice (for Lh 



negative), so that a pressure of coexistence /^, becomes possible for 



7'=0. The second member of the preceding ecpiation becomes then 



—Lb 

 = -^^ (p—Po), iind we get : 



?^—Po 



RT 



log 



( 



P + 



{nb.Yj 1 



P ^- "/iiS w"c, 



) 



quite analogous to (20), but \p\- 



{nh^ 



— (7 -:-(;. -1))%/ 7' 



substituted for ( j 



(30) 



(2/., 



?i" for 2-, and y + ("■ — 1) for y + 1. 

 If we put again : 



log 



P^- 



{nb. 



1 



= c, 



_ p -f "/br n"e_ 

 in which C may bQ considered constant (i. e. independent of p) by 

 approximation at some distance from a critical point (p. 457 loc. cit.), 

 (30) passes into : 



7? 7' ~ 



C — {y + {n-l))logT 



P—Po = 



-Lb 



• . (^^1) 



analogous to (21) on p. 458 loc. cit. Just as before, T^, i. e. the 

 temperature of the triple point can be found from this, by putting 

 p =z 0. (See also p. 460 loc. cit.). 



33. Let us now repeat the calculation on p. 461, viz. that of 

 '^o/t,., which relation is of great importance for the theory of the 

 solid state. Let us viz. put in (29") : 



