KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday April 19, 1902. 
De 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 19 April 1902, Dl. X). 
Contents: “On the action of nitric acid on alkylated amides of p-toluenesulphonic acid.” By 
Dr. P. van RoMBURGH. (Communicated by Prof. A. P. N. FRANCHIMONT) p. 616. — 
“On some further constituents of the essential oil of Kaempferia galanga L.” By 
Dr. P. van RoMmBureH. (Communicated by Prof. A. P. N. FRANCHIM xt) p. 618. — 
“On Series of Polynomials” (2nd Part). By Prof. J. C. Knuyver, 620. — “On 
the melting of binary solid mixtures by cooling.” By Prof. H. W. Bakuuis Roo- 
ZEBOOM, p. 636. — “SrArING and the coal-quaestion of Southern Limburg.” By 
Prof. J. L. C. SCHROEDER VAN DER Kork, p. 639, (with one plate). — “Bromination 
and nitration in the aromatic series.” By Dr. J. J. BLANKSMA. (Communicated by 
Prof. C. A. Lopry pe Bruyn) p. 643. — “On the effect as a time function.” By 
Prof. J. K. A. Werruemm SALOMONSON. (Communicated by Prof. C. WINKLER) 
p. 647. — “On the decomposition of mercury nitrates by heating.” By Dr. J. Myers. 
(Communicated by Prof. H. W. Baxauis RoozeBoom) p. 657, — „Contributions to 
the knowledge of vAN DER WaAats \p-surface, VI. The increase of pressure at con- 
densation of a substance with small admixtures.” By W.H, Keesom.(Communicated 
by Prof. H. KAMERLINGH Onnes). p. 659. — “The rotation of the plane of polarization 
in moving media.” By Prof. H. A. Lorentz, p. 669. — “The intensity of radiation 
and the motion of earth.” By Prof. H. A. Lorentz, p. 678. — “Ternary systems” (IIT), 
By Prof. J. D. van DER WaaALs, p. 681. — “On the infundibular region of the brain 
of Amphioxus lanceolatus.” By Dr. J. Boeke. (Communicated by Prof. T. Prace) 
p. 695. — “The principle of Entropy in Physiology.” By Dr. J. W. LANGELAAN. 
(Communicated by Prof. T. Prace), Ist part, p. 698, 2nd purt, p. 706. — “Some 
considerations on the principles of dynamics in connexion with Herrz’s” Prinzipien 
der Mechanik”. By Prof. H. A. Lorentz. p. 713. — “On the intestinal juice of 
man.” By Prof. H. J. HamBuraer and Dr. E. Hexma, p. 733. — “On the influence 
of feeding on the composition of the fat of milk.” By Dr. B. SsorLeMa. (Com- 
municated by Prof. H. J. HAMBURGER) p. 746. (with one plate.) — “The densities 
of mixtures of hydrazine and water.” By J. W. Dito (Communicated by Prof. C. A. 
Lopry DE BRUYN) p. 756. — “A method for separating crystals from alloys.” By 
Dr. C. van Eyk (Communicated by Prof. H. W. Bakuuis RoozEBoom), p. 758. (with 
one plate). — “Isotherms of diatomic gases and their binary mixtures. II. The 
determination of density with the piezometer of variable volume for low temperatures.” 
p, 761. III. The isotherms of oxygen at 20°.0 C. 15% C. 0°.0 C. p. 767. IV. The 
compressibility of Hydrogen at 0°.0 C. and 20°.0 C. determined by the piczometers 
with variable volume for low temperatures. p. 776. By Prof. H. KAMERLINGH ONNEs 
and Dr. H. H. Francis HYNDMAN. 
The following papers were read: 
41 
Proceedings Royal Acad. Amsterdam, Vol. VI. 
