( 475 ) 



and a lliiv^f-pliasc ciii-xc tMidiiiu' al ,1, a> willi llic liiulaM- alcoliols. 

 hill iiol a limit 11 Uclow w liicli llic li(|iii(ls mix in all |>r(»|M»rti(»ns. 

 riic cliaraclcr of llic oilier liraiicli ol llic crilit-al ciiinc w liicli 

 l»(\L:iiis al ( \,, Ihc crilical jkiiiiI of iiicllix lalcdiiol, llicrctbrc remained 

 iincerlain. 



I*n>r. \ AN DKK Wam.s's remarks eoneeriicd lii>ll\ llie <'\|»laiialion 

 of llic iicliavimir of llic lirsl uroiip of mixlnrcs and s(,'eondlv td' IIm* 

 diM'erenI l>clia\i«Mir of mcllivlaleoli(d and Ihc |>rcdietion of llie plie- 

 iiomcna oiilside llie liniils of oiir rescarclies. Tlie experinionls coni- 

 municalcd in lliis paper haN c rcf<'rence lo llie laller |»rol»lem. 



First of all Prof, van dkk Waals shows how llie two hranelies 

 ( \A and ('Ji mav he made into ojie conlinnons cnrvo hv prodnciniLJ: 

 llicm in the rei-ion of llie nielastahic and iinstahle conditions, a region 

 which I shall call the "tlieorcticar" reui<»n. In onr paper w (^ had 

 pointed out that the phemmicna were coniplelclv explained hy the 

 fonnation of a new siihsidiarv plait with plailpoint cinerjAinu <nit of 

 the main plait on the if'-siirfacc and the sid)sc(piciit withdrawal and 

 <Iisaj)pca ranee of the main plailpoint ')• iia\ inu r(\i;ard to nan dkij 

 Waals's (n-l;4inal invcsliüation and l(t Koktkw K(;"s treatise ") on the 

 propcrti(>s of the if'-snrfacc, the simplest iiitcrprclation appears to he 

 to assume that at some lcnn»ci"alnre higher than T{ a closed plait 

 iwj;"ins to de\elo|> on the s|>inodal cnr\c, incrcasinii' in extent as the 

 teniperalnre falls, until one of its plaitpoints — that of iIk' lirsl kind '') — 

 al .1 pierces the connodal curve of the main plait, thus uivin;:,- rise 

 to the formation of the snhsidiarx plait and the lhree-|>liasc lrian,i;l(\ 

 On fnrlher fall of teniperalnre the inner plaiti>oinl excJian<!;es partners, 

 so as lo form a closed ])lail with thai hraiich of the main plait on 

 which the (triuinal plail|>oinl lies: al /> the connodal ciirxc of the 

 main ]»lail l>ei>ins to enclose this closed pl.iit. We may moreover 

 assume the latter lo contract on fiirther cooling and ultimately shrink 

 lo nolhiiiii- '). 'rransferrinu the ahovc changes to lli(> /^-/-dia.Lirani 

 we ohtain the Jiunre dediice<l fnmi ours In Prof, van dkk Waaj.s. 



1. c. p. 358— 351>. 



2) Arch. Nécil. 'IX p. -J'.l5- :»(iS in paiiiciilai |». 3111 elc. 



'■') Cunip. KuhTE\VK(i p. ü7. 



') WlieiJR'i- this iicliiJilly lakes; \)\m-v. seems al least doiihlt'iil. The fnrointwn 

 of llie plait un eoiiling is hardly open t(» d<)ul)l, seeing that at high temperatures 

 the \J/-f;iiitaee eaiiimt simw any abiioiiualities in the region under consideialion : 

 hut Ihiü condition does not liold al low leniperatuies and tlie cunliaction of a 

 closed plait on cooling is in ronliadidion willi tlie rule eniiiu'ialed hy Pnd'. van 

 i)i:u Waai.s regaidiim llir innnriMc ot leinpe(alnie on the t-xlension of plaits. 



:i2* 



