KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday March 27, 1909. 
DOC 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 27 Maart 1909, DI. XVID. 
CO AES AT SS 
H. J. Hampurcer: “The permeability of blood-corpuscles to calcium”, p. 718. 
A. K. M. Noyons: “About observations on the electro-myogram and form-myogram under 
the influence of fatigue”. (Communicated by Prof. H. ZwaAaRDEMAKER), p. 723. (With one plate). 
A. P. H. Triveru: “A contribution to the photo-chemistry of silver (sub-)haloids”. (Commu- 
nicated by Prof. S. HooGewerrFr), p. 730. 
J. C. Krurver: “An integral-theorem of GEGENBAUER”, p. 749. 
Jan DE Vries: “A family of differential equations of the first order”, p. 756. 
S. H. Koorpers: “Polyporandra Junghuhnii, a hitherto undescribed species of the order of 
Icacinaceae, found in ’s Rijks Herbarium at Leiden (Plantae Junghuhnianac ineditae II)”, p. 763. 
J. J. van Laar: “On the solid state”. (Communicated by Prof. H. A. Lorentz), p. 765. 
(With one plate). 
O. Posrma: “On the calculation of the pressure of a gas by the aid of the assumption of a 
canonical ensemble”. (Communicated by Prof. H. A. Lorentz), p. 781. 
J. G. Steeswisk: “Contributions to the study of Serumanaphylaxis”. 2nd Communication. 
(Communicated by Prof. C. H, H. SPRONCK), p. 784. 
L. E. J. Brouwer: “Continuous one-one transformations of surfaces in themselves”. (Com- 
municated by Prof. D J. Korrewxe), p. 788. 
Pu. Konnstamm: “On the course of the isobars for binary systems”. IT (Communicated by 
Prof. J. D. vaN DER WAALS), p. 799. 
W. Karreyn: “On a class of differential equations of the first order and the first degree”, p. 813. 
J. D. van DER Waats: “Contribution to the theory of binary mixtures”. XIV. Double retro- 
grade condensation. p. 816. 
P. H. Eykman: “New methods of stereoscopy”. (Communicated by Prof. K. F. WeENCKEBACH), 
p. 832. (With 3 plates). 
49 
Proceedings Royal Acad. Amsterdam. Vol. XI. 
