KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday November 24, 1906. 



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

 Afdeeling van Zaterdag 24 November 1906, Dl. XV). 



COZvTTElsrTS. 



F. Muller: "On the placentation of Scinrus vulgaris". (Communicated by Prof. A. A. W. 

 HrBRECHT), p. 380. 



W. BiRCK: "On the influence of the nectaries and other sugar-containing tissues in the 

 flower on the opening of the anthers". (Communicated by Prof. F. A. F. C. Went), p. 390. 



A. J. P. VAN DEN Broek : "On the relation of the genital ducts to the genital gland in 

 marsupials". (Communicated by Prof. L. Bolk), p. 396. 



H. Kamerlingh Onnes and C. A. Crommelin: "On the comparison of the thermo-element 

 constantin-steel with the hydrogen thermometer", p. 403. 



W. Kaptetn: "On a special class of homogeneous linear differential equations of the second 

 order", p. 406. 



J. C. Klctver : "Some formulae concerning the integers less than « and prime to »", p. 408. 



H. J. ZwiERS: "Researches on the orbit of the periodic comet Holmes and on the pertur- 

 bations of its elliptic motion", IV. (Communicated by Prof. H. G. van de Sande Bakhüyzen), 

 p. 414. 



Fred. Schuh: "On the locus of the pairs of common points and the envelope of the common 

 chords of the curves of three pencils" (1st part). (Communicated by Prof. P. H. Sciioute), p. 424. 



E. E. MoGENDORFF: "On a new empiric spectral formula". (Communicated by Prof. P. Zeeman), 

 p. 434. 



J. A. C. OiTDEMANS : "Mutual occultations and eclipses of the satellites of Jupiter in 1908", 

 2nd part. Eclipses, p. 444. (With two plates). 



H. Kamerlingh Onnes : "Contributions to the knowledge of the ^-surface of van der Wa.ils. 

 XI. A gas that sinks in a liquid', p. 459. 



25 



Proceedings Royal Acad. Amsterdam. Vol. IX. 



