Royal Academy of Sciences. Amstepdam. 



PROCEEDINGS OF THE MEETING 

 of Saturday September 24tb 1898. 



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

 Afdeeling van Zaterdag 24 September 1898 Dl. VII). 



Contents : „Congealing points and points of transition in mixed crystals of two substances". 

 By Prof. H. W. Bakhuis Roozeboom, p. 101. — „On the influence of salt-solutions 

 on the volume of animal cells, being at the same time a contribution to our know- 

 ledge of their structure". By Dr. II. J. IIambübgeb, p. 103. 



The following papers were read : 



Chemistry. — „Congealing points and points of transition in 

 mixed crystals of two substances". By Prof. H. W. Bak- 

 huis Roozeboom. 



In 1891 the author has laid down a theory on the building of 

 mixed crystals from solutions. This theory was applied to equili- 

 brium in systems of three substances. 



Up to now no general rules had however been given for the 

 building of mixed crystals from fused mixtures of two substances. 



The investigations in this direction had either been limited to 

 the influence of small quantities of the second substance on the 

 fusing-point of the first (van 't Hoff) or, as far as this had been 

 extended to greater concentrations, it had been done without any 

 theoretical guide and had led to false conclusions (KüSTER). 



It is possible to plan a survey of the different cases of equili- 

 brium, which may present themselves between the fused mass and 

 the mixed crystals by making use of the condition of equilibrium 

 that the thermodynamic potential be a minimum. 



Now Van Run van Alkemade has already stated formerly, 

 how in case of a continuous series of solid mixtures the potential 



8 



Proceedings Royal Acad. Amsterdam. Vol. 1. 



