KONINKLIJKE AKADEMIE VAN WETENSCllArPEN 

 TE AMSTEKDAM. 



PROCEEDINGS OF THE MEETING 

 of Friday April 24, 1908. 



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

 Afdeeling van Vrijdag 24 April 1908, Dl. XVI). 



C03SrTE3SrTS. 



J. C. Ki.iYVKR : "On tlie cyclic minimal surface", p. 750. 



S. II. KooRüF.KS : "Contribution N". 1 to the knowledge of the Flora of Java", (Continuation), 

 p. 762. 



W. VAN Bkmmelkn : "The starting impulse of magnetic disturbances", p. 773. 



W. VAN Bkmmelen: "Registration of the earth-current at Batavia". {2nd Tart), p. 782. 



F. M. Jakger: "On the Tri-para-Halofjen-Substitiition Products of Triphenylmethanc and 

 Triplienylcarbinol". (Communicated by Prof. A. P. N. FranciiimontJ, p. 789. 



,7. P. VAN DER Stok: "On the analysis of fre(iuency curves according to a general method", 

 p. 7'.i'.t. 



F. A. II. SciiREiNE.MAKEKS : "Equilibria in (|uaternary systems", p. 817. 



F. A. F. C. Went: "The development of the ovule, embryo-sac and egg in Podostemaccae", 

 p. 824. 



J.4N DE Vries : "On twisted curves of genus two", p. 832 



Jan de Vries : "On algebraic twisted curves on scrolls of order n with (n— l)-fuld right 

 line", p. 837, 



H. E. J. G. DU Bois and G. J. Elias : "The influence of temperature and magnetisation on 

 selective absorption spectra", III, p. 839. 



J. D. VAN DEU Waai.s Jr.: "The value of the self-induction according to the electron-theory". 

 (Communicated by Prof. J. D. van der Waals), p. 850. 



B. W. VAN Ei.DiK Thieme: "The action of concentrated sulphuric acid on glycerol esters of 

 saturated monobasic fatty acids". (Communicated by Prof. S. A. Hoogewerff), p. 855. 



Clemend Reid and Mrs. Eleanor M. Reid: "On Dnlichium vespifornic sp. nov. from the 

 brick-earth of Tegelen". (Communicated by Prof. G. A. F. ]\Iolenoraaff\ p. 860. (With one 

 plate). 



P. Zeeman : "Change of wavelength of the middle line of triplets", (Second Partj. p. 862- 

 (With one plate). 



Erratum, p. 865. 



51 



Proceedings Royal Acad. Amsterdam. Vol. X. 



