( 577 ) 



The followiiiu- (|iiaiitili(^s are fiirllier (ImiikI at the cfitical poiiil, 

 which arc iicccssarv for the coiuparisou of the ohscrxatioiis with the 

 llieoretical results of ('omnis. N". 75 and X", (S| : 



C,=. -, = 3.45. 



-^r*i==..7i2. 



Here, in aureeiiieut with the \aliie óf the eoefflcient of c.\|)ansi())i 

 lor the ideal «■useoiis state accepted in this Coiuni, III, p. ."^.-^.S we 

 have put : 7\ — 27:i()4. 



Physics. — "' IsolliciiiKil.s <\f niivturcs of ('■ri/(/('i/ di/d (■(//■//<ii/ </i(i.i/</t' . 

 \. I.s(>th<'rni<ils of nii.vtnn'soffhi' i/oi/rc/f/i/r com f/os/fKU/s i). {04:7 

 Olid O.J 1)1)4 of o,r//(/('ii, <iiid flic' coiiijinri^on of flicni ii'illi I hose 

 of pitrc (uirhoii dio.ridi'^' . \\\ W. II. Kkkso.m. Comniiiiiicatioii 

 N". <S(S (.5''' pai-t) from the Physical Laboratory at Leiden hy 

 Prof. Kamkri-ingii Onnes. 



(Clouiimuiicaled in the aieetiiig of Oclulioi- ;U, lIKIo.) 



§ L The followinii' sections contain the tables about l\y() nnxtures 

 of carbon dioxide and ox\\üen. Foi' the nieaiiinu' of /•. /y, /■,;,/. and 

 (he deterniination of the h.c- and the ^'.r-points I i-efei- to this Conini. 

 IV § 2. Of the end condensation i)oint it should be remarked that over 

 a dellnile area below and aboye the jjlaitpoint temperature the meniscus, 

 in conse<|uence of the ellecl of urayilation, disappeared in the lube. 



'J1ie data about lhe plailpoint were deri\ed diivctlv from the 

 (\\|»criment. On the pluMiomena near the plaiti)oinl I lin<l lhe followin.U' 

 i-emarks am()ii,«;- mv notes of the obser\atious : When the xolume 

 increases from the homoucneoiis (li(iuid) state a blue mist gradually 

 forms itself. As the \-olume increases (small \ariations at a time) 

 this becomes denser. If the \olume increases slill more, layers of 

 dilferejit deurc^es of refran.uibilil y sud<lenly appe;n', which (juiiddy 

 mo\(' amoni:- ihemseh'es. When \ye stir, liowex'cr, they still dissolye 

 into the Ihickemn.u' blue mist. Al a -ixcn uKunent, after the xolume 

 has been incjvased aiiain a little, these layers bci-in to concenlrale 

 towards the middle of the tid)e, at lhe top and al the bolloui it 



