( 183 ) 



^/ 



Ó 0,i OZ Oh 0^^ O^S Üó 0,y 0,S OM --Ie 



Ether- X Antliruquinone. 



Fig. !26-. 



(lifTerciit ways. Iii li^'. %( tlie regions i)jissc<l are inai-kcd with aiTows. 



1 indicates the transitiuji tVom the region for F,^ -|- solid anthra(|uin<)ne 

 into the region tbr i'Y -|- solid antraquinone, the three pliases appearing 

 interniedially. F,, denotes iiere a fluid phase which in ordinary cir- 

 cumstances, that is to say l)elo\v the critical temperature of ether, 

 would be called gas-phase ; and Fj^ denotes a fluid phase which in 

 ordinary circumstances would be styled li(iuid phase. It is evident 

 that the difference between F,j and Fi, exists solely in their foregoing 

 histor3\ 



2 marks the transition from the region F,j -\- anthraipiinone into 

 the region F]^, the three [)hases appearing intermeditilly. 



3 indicates essentially the same as 2, but yet the phenomenon is 

 somewhat different, because now we do not in the ^\\C\. pass the 

 li(piid branch, as in 2, but the vapour-branch; this is marked by the 

 sign F,j over the branch t'.^ /•.,. 



4 is a N'ei-y remarkable transition, as here we pass directly from 

 the region for F,, -\- solid anthi-aquinone into the region for F(f. 



As to the lack of rclrogi-ade condensation at lempei'atures between 

 247° ajid =b 2()<)'' and its api»earance at higher temj)eratures, 1 want 



