KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XXVI 

 NOS. 5 and 6. 



President: Prof. F. A. F. C. WENT. 

 Secretary : Prof. L. BOLK. 



(Translated from : "Verslag van de gewone vergaderingen der Wis- en 

 Natuurkundige Afdeeling," Vol. XXXII). 



CONTENTS. 



J. C. KluyveR: "On EULER's Constant", p. 316. 



J. P. WiBAUT and J. J. DiEKMANN: "Researches on the Addition of Water to Ethylene and Propylene". 



(Communicated by Prof. A. F. HOLLEMAN), p. 321. 

 W. H. JULIUS and M. MiNNAERT: "The relation between the widening and the mutual influence of 



dispersion lines in the spectrum of the sun's limb", p. 329. 

 J. P. BANNIER: "Cytological investigations on Apogamy in some elementary species of Erophila 



verna". (Communicated by Prof. F. A. F. C. WENT), p. 349. 



F. W. 'I'. HUNGER: "On the nature and origin of the cocos-pearl". (Communicated by Prof G. VAN 



ITERSON Jr.), p. 357. 



Th. Valeton : "The genus Coptosapelta KORTH". (Rubiaceae). (Communicated by Prof J. W.MOLL), 

 p. 361. 



D. TOLLENAAR: "Dark Growth-responses". (Communicated by Prof. A. H. Blaauw), p. 378. 



JAN DE VRIES: 'Representation of a Tetrahedral Complex on the Points of Space", p. 390. 



A. SmitS: "The Electromotive Behaviour of Magnesium". II. (Communicated by Prof. P. Zeeman), 

 p. 395. 



D. S. FernandeS: "A method of simultaneously studying the absorption of Q.^ and the discharge 

 of CDs in respiration". (Communicated by Prof. F. A. F. C. WENT), p. 408. 



H. J. Hamburger: "A new form of correlation between organs", p. 420. 



J. P. WiBAUT and Miss Elisabeth Dinoemanse: "The Synthesis of some Pyridylpyrroles". (Com- 

 municated by Prof P. van RombURGH), p. 426. 



G. M. KRAAV and L. K. WOLFF; "The splitting of lipoids by Bacteria". (First communication). 



(Communicated by Prof. C. Evkman), p. 435. 



J. B. ZWAARDEMAKER: "The Presence of Cardio-regulative Nerves in Petromyzon fluviatilis". 

 (Communicated by Prof. H. Zwaardemaker), p. 438. 



W D. COHEN; "The light Oxidation of Alcohol (111). The Photo-Catalytic Influence of some Series 

 of Ketones on the light Oxidation of Ethyl Alcohol". (Communicated by Prof. J. Böeseken), p.443. 



M. J. BelinfantE: "On Power Series of the Form: xP" — .xPi + xP^ — . ." (Communicated by Prof. 

 L. E. J. BROUWER), p. 456. 



F. F. Hazelhoff and Miss Heleen Wiersma; "On Subjective Rhythmisation". (Communicated by 

 Prof. E. D. Wiersma), p. 462. 



R. Brinkman and A. v. Szent-Qyoroyi: "Researches on the chemical causes of normal and patho- 

 logical Haemolysis". (Communicated by Prof. H. J. HAMBURGER), p. 470. 



L. HAMBURGER: "Nitrogen fixation by means of the cyanide-process and atomic structure". (Com- 

 municated by Prof. P. Ehrenfest), p. 480. 



F. D'HERELLE: "Culture du bacteriophage sans intervention de bactéries vivantes". (Présenté par 

 Mr. le Prof. W. Einthoven), p. 486. 



V. VAN Straelen: "Description de Crustacés décapodes nouveaux des terrains tertiaires de Borneo". 

 (Présenté par Mr. le Prof. H. A. BROUWER), p. 489. 



C. WINKLER: "A partial foetus removed from a child", p. 493. 



Erratum, p. 496. 



n~ 



Proceedings Royal Acad. Ainsterdain. Vol. XXVI. 



