( 175 ) 



e, e^, '(\ and d, tlieso lines indicate the said /, .r-projeclions; ah is 

 the crilical cnrvc, cd tlie enrve of Ihe sain rated sohitions and cd 

 Ihat of Ihe vai)oni-s salnraled with ./J. In aceordanee with lig. 1 

 tlie whole of the ci-ilieal cui've lies above the solnbilitj enrve; above 

 the ei-itical enrve lies the gas-rei>ion and below [\w sohibilih (•iir\'e 

 the region of solid 7j* -|- vaponr or of the siijtcrsatHrtfied soinlions. 



After what |)recedes the connection between the tig. 2 and 4 is 

 easy to see. 



The solnbilitj of B in A at the temperatnre /, being small, the 

 vaponr and liqnid-Iines ae and ric are short. Above /, ffc and ^/r 

 again tlnently pass into each other and liaxe already approaciied 

 nearer to each other, becanse the satni-aled solntion (\ and the 

 coexisting va[)oni' (\ ditfcr less from each other; a conseqnence 

 of this is tiiat the lines (j^e^ and (\/\ have also approached to cacii 

 other. At t^, the first critical temperatnre of the satnrated solution, 

 the solubility enrve cc\ p, the vaponr-line ee^p and the critical enrve 

 aa^ j) concnr. This implies that at this temperature the enrve (/.^it 

 for the vapour coexisting with solid B is the prolongation of the 

 curve p/\ for the solution coexisting with solid B. The same occurs 

 at a great many higher temperatures. 



That a continuation of the lines cp and cj) is liinniliKin/, clearlv 

 appears from this diagram, as the vapoui-- and the li(pii(l-liiie, if 

 l)oth were prolonged, would change places, which is im[)ossil)le. ^) 



Whereas from t^ to t^ saturated solutions are absolutely impossible, 

 at t^ the same phenomenon occurs as at t.^\ here also the solid>ility 

 curve '/«".//, the vapour-line dejj and the ci'itical cui-ve ha.^ a.^ y con- 

 verge and the critical phenomenon is observed with a xaluratcd 

 solution. 



At higher teni])eratnres a convergence of the three curves can 

 no longer occur and in consequence all critical temperatures 

 between t^ and t^, just as between /j and/,, ai-e ci-itical tenqieratnres 

 of uiiMitu rated solutions. If between p and (j solution -\- vapour -|- 

 solid B be impossible, it is conceivable, as suggested bef(U"e, that 

 we may succeed in getting siipeisatm-afed solutiors and observing 

 their critical })henoniena. In such a case the dotted ci'itical enrve 

 if prolonged might be realized between /> and (/, so this dolled line 

 is metastaf'Ie. 



For a thorough knowledge of the phenomenon a p, ./■, /'-diagram 

 is most desirable and a r, .r, /'-diagram indispensable, llolli sj>ace- 



1) In tlic fu'.^l coniniiinicatiun, Zeilsclir. 1'. Elektr. 33, OGo, llii.s point was not 

 suflicienlly cleared u[). 



