KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS OF THE MEETING 
of Saturday September 25, 1909. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 25 September 1909, Dl. XVIII). 
COITTEirTS. 
the plaitpoint surface meets the two-sheet three-phase surface”. (1st Communication). (Com¬ 
municated by Prof. J. D. van der Waals;, p. 182. 
(Communicated by Prof. A. F. Holleman), p. 186. 
H. E. J. G. du Bois: “An improved semicircular electromagnet”, p. 189. (With one plate). 
Th. Weevers: “The physiological significance of certain glucosides”. (Communicated by Prof. 
C. T. VAN Valkenburg : “Surface and structure of the cortex of a microcephalic idiot”. (Com¬ 
municated by Prof. L. Bout), p. 202. (With one plate). 
M. J. van Uven: “Investigation of the functions which can be built up by means of infinitesimal 
iteration. Contribution to the solution of the functional equation of Abel”. (Communicated 
by Prof. W. Kapteyn), p. 208. 
J. Kuyper: “The influence of temperature on the respiration of the higher plants". (Communicated 
by Prof. F. A. F. C. Went), p. 219. (With one plate). 
A. Smits: “On retrogressive melting-point lines”. (1st Communication). (Communicated by Prof* 
J. D. van der Waals), p. 227. 
A. Smits : “The P, J’.A'-spacial representation of the system ether-anthraquinone". (Communicated 
by Prof. J. D. van der Waals), p. 231. (With one platei. 
two liquids”. (Communicated by Prof. J. D. van der Waals), p. 234. (With one plate). 
A. Smits and J. P. Wtjite: “On the system water-natrium sulphate”. (Communicated by Prof. 
A. F. Holleman), p. 244. 
F- E. C. Scheffer: “On heterogeneous equilibria of dissociating compounds”. (Communicated 
by Prof. A. F. Holleman), p. 257. 
W. H. Julius: “Regular consequences of irregular refraction in the sun” p.266. (With 3 plates) 
13 
Proceedings Royal Acad. Amsterdam. Vol. XII. 
