KONINKLIJKE AKADEMIE VAN AVETENSCIIAITEN 

 TE AMSTEEDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday February 27, 1904. 



(Translated from : Verslag van de gewone vergadering der Wis- en Natuurkundige 

 Al'deeling van Zaterdag 27 Februari 1904, Dl. XII). 



OOnSTTEIsTTS. 



H. W. Bakiuis KdóZF.r.ooM iiiul A. II. W. Atkn : "TIil' iiicltiiij^ ];oiiit lines of the system 

 sulphur -f- ciiloiiuc", p. 5'J'.). 



A. W. VissKij : "Enzymactiuns cuiisideiod as equilibria in u hoiuugeuuus system". (Comuni- 

 nicatcd by Prof. C. A. Lobüy de Bruyn), )). 605. 



A. J. P. VAN DEN Bkoek: "The foetal membranes ami the placenta of riiuea vitulina." 

 ((.lommunicated by Tiof. L. Roliv), p. 610. 



W. Kai'Teijn : "On the ditleiential e(|uatiün of ]\lt>xc;K", \k 620. 



W. A. Vkusi,i:ys: "'J'lie singularities of the foeal curve of a plane general curve touching 

 the line at intinity n times and passing e times through each of the imaginary circle points at 

 infinity." (Communicated by Prof. P. H. Sc'iioute), p. 621. 



W. A. Veksluys: "On the position of the three points which a twisted curve has in eonimon 

 with its osculating plane." (Communicated by Prof. P. H. Scuoute), p. 622. 



A. S.Mrrs: "A contribution to the knowledge of the course of the decrease of the vainnn- 

 tension for aqueous solutions." (Communicated by Prof. II. W. Bakhuis Koozeboom), J). 628. 

 (With one plate). 



II. Kamehlingii Onnes and C. A. Cuommelix: "On the measurement of very low temperatures. 

 VI. Improvements of the protected thermoelements; a battery of standard-thermoelements and 

 its use for thermoelectric determinations uf temperature", \). 642. (With 2 plates). 



J. E. Verschaffelt : "(.Contributions to the knowledge of van deu W.v.vi.s' ^-surface. VIII. 

 The i-surface in the neighbourhood of a binary mixture which behaves as. a pure substance." 

 (Communicated by Prof. II. Kamehunuii Onnes), p. 649. (With one plate). 



The following papers were read : 



Chemistry. — ^'The inchuuj poinl lines of the si/stmi sulphur 

 -\- chlorine.'' Hy Prof. H. W. Bakiilis Roozeboom and 

 A. H. W. Aten. ' 



(Communicated in the meeting of January 30, 1901). 



The boiling point lines of this system have already been described 

 at the meeting in May 1903. These led to (he view that the com- 

 ponnd S2CI2 in tlie liquid and vaporous condition is but very little 

 dissociated and also tiiat further compounds occur at a not too low 

 temperature in liquids with a higher proportion of chlorine. 



40 



Proceedings Royal Acad. Amsterdam. Vol. VI, 



