KONINKLIJKE AKADEMÏE VAN WETENSCHAPPEN 

 TE AMSTEEDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday November 25, 1905. 



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

 Afdeeling van Zaterdag 25 November 1905, Dl. XIV). 



aOlSTTIEÜTTS. 



EuG, Dubois : "The geographical and geological signification of the Hondsrug, and the 

 examination of the erratics in the Nf ;hern Diluvium of Holland", (Communicated by Prof. 

 K. Martin), p. 427. 



D. J. KoRTEWEG: "HuvGENs' svmpathic clocks and related phenomena in connection with 

 the principal and the compound oscillations presenting themselves when two pendulums ai'e 

 suspended to a mechanism with one degree of freedom", p. 436. 



H. W. Bakhuis Eoozeboom : "The different branches of the three-phaselines for solid, 

 liquid, vapour in binary systems in which a compound occurs", p. 455. 



F. M. Jaeger: "On Diphenylhydrazine, Hydrazobenzene and Benzjlaniline, and on the 

 miscibility of the last two with Azobenzene, Stilbene and Dibenzyl in the solid aggregate con- 

 dition". (Communicated by Prof. H. W. Bakhuis Roozeboom), p. 466. 



A, P. N. FRAKCHiMONTand H. Friedmank: "Theamidesofa-and ,3-arainopropionicacid", p. 475, 



J. D. VAN DER Waals Jr. : "Remarks concerning the dynamics of the electron". (Commuiii- 

 oated by Prof. J. D. van der Waals), p. 477. 



R. Sissingh: "Derivation of the fundamental equations of metallic reflection from Cauchy's 

 theory". fCommunicated by Prof. H. A. Louentz), p. 486. 



P. H. ScHOUTE: "A tortuous surface of order six and of genus zero in space Spi of four 

 dimensions", p. 489. 



W. Versluys: "The Plucker equivalents of a cyclic point of a twisted curve" (Communicated 

 by Prof. P. H. Schoute), p. 498. 



"Preliminary Report on the Dutch expedition to Burgos for the observation of the total solar 

 eclipse of August 30, 1905," communicated by Prof H. G. van de Sande Bakiiuyzen, in behalf 

 of the Ecli]ise ommittee, p. 501. 



Geology. — "The geographical and geological signification of the 

 Hondsrug, and the examination of the erratics in the Northern 

 Diluvium of Holland." By Prof. Eug. Dubois. (Communicated 

 by Prof. K. Martin). 



(Communicated in the meeting of September 30, 1905). 



To those who do not know the Hondsrug from a personal visit 



the name generally suggests an imposing hilly ridge, or perhaps 



even a small mountain range. Visiting it for the first time, one is 



disappointed in finding it to be no more than a nearly iinper- 



30 

 Proceedings Royal Acad. Amsterdam. Vol. VIII. 



