( 27 ) 

 2X505,3 



Person found for the latent heat of solidification for tin 

 14,252 X 118,5 = 1689 Gr. cal. 

 The diifcrence is so small, that we may assume also hei-e that the 

 .nlver is present as atom also in tin. This conclusion is the more 

 justified as Heycock and Neville ^xxa for ■?;: "somewhat smaller (haii 

 0,0385", from which follows that 6 will be somewhat greater and 

 7o somewhat smaller, so that </„ approaches still more to '1690. 



I draw attention to the fact, that the good agreement of I he value 

 for till found by Person justifies the conclusion that this value is 

 really rather accurate, so that we must assume that the incrruni 

 (see my previous communication), solved in tin, is ])resent in par- 

 tially associated condition, the association amounting to about 1,5. 

 It a[)peared namely that — when mercury did not occur in the solid 

 phase, which consisted therefore exclusively of tin — the value 

 of was such, that it yielded q^ = 2550. In order to make this 

 value 1^ times smaller, nnist be augmented, i.e. j; must be dimi- 

 nished, and this can only be done by assuming associaticm to the 

 same amount. 



V. Let is now return to the question of the /)oint of inflection 

 on the melting-point curve. From : 



1 + 



(1 + r.r)^ 



" 1— ^%/(l— .7,-) 



follows 



(IT _ 1\ f^ cuv' ^ 7'„ 2« 



therefore 





cPT 1\ nJ) \ ( ax- 



-11 + 



or 



dx'' N''{\-xf\N )\ ' (1 +?•./■)■■' 

 J. 2«.. T, 2«(l-2r.f) 





+ 



, 2«M1— 27v»)1 



^~^.^\ '=" 



If rr=r0, this equation may be wi-illen : 



