KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday April 22, 1905. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 22 April 1905, Dl. XIII). 
GONE Nr WS: 
J. J. van Laar: “On the different forms and transformations of the boundary-curves in the 
case of partial miscibility of two liquids”. (Communicated by Prof. H. W. Baxuvuis RoozEnoom), 
p. 636. (With one plate). 
J.J. van Laar: “An exact expression for the course of the spinodal curves and of their 
plaitpoints for all temperatures, in the case of mixtures of normal substances”. (Communicated 
by Prof. H. A. Lorentz), p. 646. 
F. M. Jarcer: “On miscibility in the solid aggregate condition and isomorphy with carbon 
compounds”, (Communicated by Prof. H. W. Baxuvis RoozrBoom), p. 658. (With one plate). 
F. M. Jarcer: “On Orthonitrobenzyltoluidine”. (Communicated by Prof. A. F. HorLEMAN), p. 666. 
F. M. Jarcer: “On position-isomcrie Dichloronitrobenzenes”. (Communicated by Prof. A. F. 
HorrrMaN), p. 668. 
H. Kameruiscu Onnes and W. Heuser: “On the measurement of very low temperatures, 
V. The expunsioncvefficient of Jena- and Thüringer glass between + 16° and — 182° C.” p. 674. 
(With one plate). 
H. A. Lorentz: “The motion of electrons in metallic bodies”, ILI, p. 684. 
H. G. Jonker: “Contributions to the knowledge of the sedimentary boulders in the Netherlands. 
I. The Hondsrug in the province of Groningen. 2. Uppersilurian boulders. 2nd Communication: 
Boulders of the age of the Eastern Baltic Zones H and I’. (Communicated by Prof. K. Martin), 
p- 692. 
Ernst pe Vries: “Note on the Ganglion vomeronasale”. (Communicsted by Prof. T. Prace), 
p- 704. (With one plate). 
J. W. van Bissruek: “Note on the Innervation of the Trunkmyotome”. (Communicated by 
Prof. T. Prace), p. 708. (With one plate). 
JAN DE Vries: “On linear systems of algebraic plane curves”, p. 711. 
Jan DE Vries: “Some characteristic numbers of an aigebraic surface”, p. 716. 
K. Bes: “The equation of order nine representing the locus of the principal axes of a pencil 
of quadratic surfaces”. (Communicated by Prof. J. Carpinaar), p. 721. 
Pu. Konnstamm: “A formula for the osmotic pressure in concentrated solutions whose vapour 
follows the gas laws”. (Communicated by Prof. J. D. van per Waars), p. 723. 
Pu. Konnstamm: “Kinetic derivation of van ’r Horr’s law for the osmotic pressure in a 
dilute solution”. (Communicated by Prof. J. D. van per Waars), p. 729. 
Pu. Korysramu: “Osmotic pressure and thermodynamic potential”. (Communicated by Prof. 
J. D. van DER Waars), p. 741. 
J. Weeper: “Approximate formulae of a high degree of accuracy for the relations of the 
triangles in the determination of an elliptic orbit from three observations”. (Communicated by 
Prof. Il. G. van DE SANDE BAKHUYZEN', p. 752. 
A. W. Visser: “A few observations on autocatalysis and the transformation of j-hydroxyacids, 
with and without addition of other acids conceived as an ion-reaction”. (Communicated by 
Prof. H. J.;HAMBURGER), p. 760. 
Artuur W. Gray: “Application of the baroscope of the determination of the densities of gases 
and vapours’. (Preliminary Notice). (Communicated by Prof. H. KAMERLINGE ONNES), p. 770. 
The following papers were read: 
44 
Proceedings Royal Acad. Amsterdam. Vol. VII. 
