KONINKLLTKE AKADËMIË VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday February 28, 1914. 

 Vol XVI. 



President: Prof. H. A. Loriwtz. 

 Secretary: Prof. P. Zeb^man. 



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

 Afdeeling van Zaterdag 28 Februari 1914, Dl. XXII). 



OOliTTEIsrTS. 



H. Haga and F. M. Jakokr : "RÜKTGENpatterns of Boracite, (jbtained above and l)elo\v 



its inversion-temperature", p. 792. (With one plate). 

 F. M. Jaeger and Ant. Simek : "On temperature-measurements of anisotropous bodies by 



means of radiation-pyrometers". (Communicated by Prof. H. Haga), p. 799. 

 Ernst Cohen: "AUotropy and electromotive Equilibrium", p. 807. 

 J. J. van Laar: "A new relation between the critical quantities, and on the unity of all the 



substances in their thermic behaviour". (Communicated by Prof. H. A. Lorentz), p. 808. 

 Ph. KoHNST.iMM and K. W. Walstra: "An apparatus for the determination of gas isotherms 



up to about 3000 atm." (Continuation). (Communicated by Prof. J. D. van dkr Waals), 



p. 822. 

 J. A. Honing: "Experiments on Hybridisation Avith Canna iudica". (Communicated by Prof 



F. A. F. C. Went J, p. 835. 

 F. A. H. ScHREiNEMAKERS : "Equilibria in ternary systems" XIIL, p. 841. 

 F. M. Jaeger and H. S. van Kt-ooster : "Studies in the Field of Silicate Chemistry. I. On 



Compounds of Lithiumoxide and Silica. (Communicated by Prof. P. van Homhurgh), p. 857. 

 J. D. van der Waals : "The volume of molecules and the volume of the comjionent atoms". 



p. 880. 

 J. 1*1 DE Vos VAN Steenwijk: "Investigation of the ineciualities of approximately monthly 



period in the longitude of the moon according to the meridian observations at Greenwich." 



Addendum. (Communicated by Prof. E. F. van de Sande Bakhuyzen), ]). 890. 

 E. OoSTERHi IS : "Magnetic researches. XL Modificntion in the cryomagnetic apparatu.s of 



Kamerlingii Onnes and Perrier". (Communicated by Prof. H. Kamerlingh Onnes), 



p. 892. 

 Albert Perrier and H. Kamerlingii Onnes : "Magnetic researches. XIL Tlie susceptibility 



of solid oxygen in two form i", p. 894. 

 Albert Perrier and H. Kamerlingh Onnes: "Magnetic .researches XIIL The susceptibility 



of liquid mixtures of oxygen and nitrogen, and the influence of the mutual distance 



of the molecules upon paramagnetism", p. 901. 

 H. Kamerlingh Onnes and E. Oosterhuis: "Magnetic researches. XIV. On paramagnetism 



at low temperatures". (Continuation of VII\ p. 917. 

 K. Martin: "At what time the Indian Archipelago is separated from the Tethys", p. 921. 



51 



Proceedings Royal Acad. Amsterdam. Vol. XVI. 



