KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XXVI 

 N°s. 3 and 4. 



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

 Secretary : Prof. L. BOLK. 



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

 Natuurkundige Afdeeling." Vols. XXXI and XXXII). 



CONTENTS. 



Jan de VREES: "A Null System (1, 2, 3)", p. 124. 



JAN DE VRIES: "A Congruence (1,0) of Twisted Cubics ', p. 126. 



Jan de VRIES: "A Representation of tlie Line Elements of a Plane on ttie Tangents of a Hyper- 



boloid", p. 129. 

 C. U. ARIËNS KAPPERS: "The ontogenetic development of the Corpus striatum in birds and a 



comparison with mammals and man", p. 135. 

 - H. A. Brouwer and L. F. de Beaufort: "On Tertiary Marine Deposits with fossil-fishes from 



South Celebes", p. 159 

 H. A. BROUWER: "Fractures and Faults near the Surface of Moving Geanticlines. III. The Horizontal 



Movement of the Central-Atlantic Ridge", p. 167. 

 J. M JANSE: "On stimulation in au.xotonic movements". (Communicated by Prof. J. C. SCHOUTE), 



p. 171. 

 J. WOLFF: 'On the Points of Continuity of Functions' (Communicated by Prof. Hendrik DE VRIES), 



p. 187. 

 J. WOLFF: "Inner Limiting Sets". (Communicated by Prof. HENDRIK DE VRIES), p. 189. 

 W. F. GiSOLF: "On the Rocks of Doormantop in Central New Guinea". (Communicated by Prof. 



G. A. F. MOLENQRAAFF), p. 191. 



I. SWEMLE and L. RutteN: "New Findings of Pliocene and Pleistocene Mammals in Noord-Brabant, 

 and their Geological Significance". (Communicated by Prof. 0. A. F. MOLENQRAAFF), p. 199. 



M. J. BelinfantE: "A Generalisation of MERTENS' Theorem". (Communicated by Prof L. E. J. 

 BROUWER), p. 203. 



M. J. BELINFANTE: "On a Generalisation of TaubeR's Theorem concernin:; Power Series'. (Com- 

 municated by Prof. L. E. J. BROUWER), p 216. 



H. I. WATERMAN and J. N. J. PerquiN: "Hydrogenation of Paraffin by the BERQIUS' Method". (Com- 

 municated by Prof. J. BoESEKEN), p. 226. 

 ~ 0. POSTHUMUS: "Contributions to our Knowledge of the Palaeontology of the Netherlands. I. 

 Otoliths of Teleostei from the Oligocene and the Miocene of the Peel-district and of Winters- 

 wijk". 'Communicated by Prof. j. C. SCHOUTE), p. 231. 

 ' O. POSTHUMUS: Ibid. II "On the Fauna of the Phosphatic Deposits in Twente. (Lower Oligocene)". 

 (Communicated by Prof. J. F. VAN Bemmelen), p. 235. 



C. B. BlEZENO; "An appHcation of the theory of integral equations on the determination of the 

 elastic curve of a beam, elastically supported on its whole length '. (Communicated by Prof. 

 J. C. KLUIJVER), p. 237. 



J. DROSTE: "An application of the theory of integral equations on the determination of the 

 elastic curve of a beam, elastically supported on its whole length". (Communicated by Prof. 

 J. C. KLUIJVER), p. 247. 



A, Smits : "The Phenomenon of Electrical Supertension" III. (Communicated by Prof. P. ZEEMAN), 

 p. 259. 



A. SmitS: "The Influence of Intensive Drying on Internal Conversion" I. (Communicated by Prof. 

 P. Zeeman), p. 266. 



A. S.mitS: "The System Sulphur Trioxide". I (Communicated by Prof. P. Zeeman), p. 270. 



L. RutteN: 'Geological data derived from the region of the "Bird's head" of New-Guinea', p. 274. 



H U. KLOOSTERMAN: "A theorem concerning power-series in an infinite number of variables, with 

 an application to DiRICHLET's series". (Communicated by Prof. J. C. KLUIJVER;, p. 278. 



F. A. H. SCHREINEMAKERS: "In-, mono- and divariant equilibria'. XXIII, p. 283. 



O. H. DIJKSTRA: "The Development of the Shoulder-blade in Man '. (Communicated by Prof. L. BOLK), 

 p. 297. 



G. J. VAN OORDT: "Secondary sex-characters and testis of the ten-spined Stickleback (Gasterosteus 



pungitius L.) . (Communicated by Prof. J. BOEKE), p. 309. 



Proceedintjs Royal Aoad. Amslenlain. Vol. XXVI. 



