KONINKLIJKE AKADEMIE VAN WETENSCHArrEN 

 TE AMSTEEDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday January 27, 1906. 



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

 Afdeeling van Zaterdag 27 Januari 1906, Dl. XIV). 



C02iTTEIsrTS. 



F. M. Jaeger: ■•Contribution to the knowledge of the isomorphous substitution of the 

 elements Fluorine, Chlorine, Bromine and Iodine, in organic molecules". (Communiniitcd by 

 Prof. A. P. N. Fra>-chimoxt), ji. 614. (With one plate). 



L. VAN Itallie: "On catalases of the blood'. (Communicated by Prof. C. A. Pekelhari>o), p. 623. 



L. van Itallie; "On the differentiation of fluids of the body, containing proteid". (Commu- 

 nicated by Prof. C. A. Pekelharing), p. 628. 



O. Postma: "Some remarks on the quantity H in BoltzmanVs "Vorlesnngen iiber Gastheorie". 

 (Communicated by Prof. H. A. Lorentz), p. 630. 



F. A. F. C. Went: "Some remarks on the work of Mr. A. A. Pclle, entitled; "An enumeration 

 of the vascular plants known from Surinam, together with their distribution and synonymy", 

 p. 639. 



W. Kapteyn: "The quotient of two successive Bessel functions", (2nd paper), p. 640. 



H. J. ZwiERS : "Researches on the orbit of the periodic comet Holmes and on the perturbations 

 of its elliptic motion". 'Communicated by Prof. H. G. van de Sande Bakhutzen), p. 642. 



L. S. (^)rnstein : "On the motion of a metal wire through a lump of ice". (Communicated by 

 Prof H. A. Lorentz), p. 653. 



P. P. C. Hoek : "On the Polyandry of Scalpellum Stearnsi", p. 659. 



Jan de Vries : "A group of complexes of rays whose singular surface consists of a scroll and 

 a numbei- of planes", p. 662. 



Crystallography. — "Contribution to the knowledge oj- the isomor- 

 pltous .iiihstitution of the elements Fluorine, Chlorine, Bromine 

 and Iodine, in organic molecules". By Dr. F. M. Jaeger. 

 (Communicated by Prof. A. P. N. Franchimont). 



(Communicated in the meeting of November 25, 1905). 



Some time ago a paper was published by Gossner ') on the crystal- 

 forms of Chlorobromonitrophenol, Dibromonitrophenol and lodobromo- 

 nitrojthenol being an experimental contribution to the knowledge of 



1) B. Gossner, Krystallogiaphische Untersuchung organischer Halogenverbin- 

 dungen. Ein Beitrag zur Kenntniss der Isomorphie von Gl, Br und J. Zeitschr. f. 

 Kryslall. Bd. 40. (1903). 78—85. 



43 



Proceedings Royal Acad. Amsterdam. Vol. VIII. 



