KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XXVI 

 N»^ 9 and 10. 



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. 



B. SjOLLEMA and Miss J. E. van der Zande: "Researclies on the Metabolism of Milcli-cows 

 suffering from Acetonemia". (Communicated by Prof. C. Eykman), p. 666. 



0. POSTHUMUS: "Etapteris Bertrandi Scott, a new Etapteris from the Upper Carboniferous (Lower 

 Coal-Measures) from England, and its bearing to stelar-morphological questions". (Communi- 

 cated by Prof. J. W. MOLL). (With one plate), p. 669. 



0. DE Vt<lES: "The coagulation of Hevea latex". (Communicated by Prof. P. VAN ROMBURQH), p. 675. 



M. W. WOERDEMAN: "On the Determination of Polarity in the Epidermal Ciliated cell. (After expe- 

 riments on Amphibian Larvae)". (Communicated by Prof. L. Bolk), p. 702. 



M. W. WOERDEMAN: "A Contribution to the Histophysiology of the Ciliated Epithelium". (Commu- 

 nicated by Prof. G. VAN RlJNBERK), p. 707. 



S. W. VISSER: "A non-tangent infralateral arc". (Communicated by Prof. E. VAN Everdinqen Jr.), 

 p. 712. 



F. A. H. SCHREINEMAKERS: "In-, mono- and divariant equilibria". XXIV, p. 717. 



J. W. VAN WijHE: "Thymus, spiracular sense organ and fenestra vestibuli (ovalis) in a 63 mm. 

 long embryo of Heptanchus cinereus", p. 727. 



Miss L. KAISER: "Contributions to an experimental phonetic investigation of the Dutch language. 

 1. The short o". (Communicated by Prof. G. VAN RlJNBERK), p. 745. 



Th. WEEVERS: "Ringing Experiments vvith variegated branches". (Communicated by Prof. J. W. 

 MOLL), p. 755. 



J. VAN DER HOEVE and H. J. FLIERINOA: "Determination of the Power of the Accommodation- 

 Muscle", p. 763. 



J. G. DusSER DE Barenne and J. B. Zwaardemaker : "On the Influence of the vagi on the frequency 

 of the action currents of the Diaphragm during its respiratory Movements". iCommuiiicated 

 by Prof. H. ZWAARDEMAKER), p. 771. 



V. VAN STRAELEN: "Description de Raniniens nouveaux des terrains tertiaires de Borneo". (PrésentC- 

 par M. le Prof. G. A. F. Molengraaff), p. 777. 



F. KÖLMEL: "Ueber die zu einem Punkte und einer Geraden gehörigen Polarkurven inbezug auf 



eine gegebene algebraïsche Kurve". (Mitgeteilt von Prof. JAN DE VRIES), p. 783. 

 L. E. J. BROUWER: "Ueber den natiirlichen Dimensionsbegriff", p. 795. 

 R. WEITZENBÖCK: "Ueber Invarianten von Bilinearformen". (Mitgeteilt von Prof. L. E.J. BROUWER), 



p. 801. 

 A. MICHELS: "The Influence of Rotation on the Sensitiveness and the Accuracy of a Pressure 



Balance". (Communicated by Prof. P. ZEEMAN), p. 805. 

 John I. Hunter: "The Forebrain of Apteryx Australis". (Communicated by Prof. L. BOLK), p. 807. 

 Mistress E. WiNKLER-JUNIUS and J. A. LATUMETEN: "The histopathology of Lyssa in respect to the 



propagation of the lyssavirus". (Communicated by Prof. C. WINKLER). (With one plate), p. 825. 



G. Breit and H. Kamerlinqh OnneS: "Magnetic Researches. XXVI. Measurements of Magnetic 

 Permeabilities to Chromium Chloride and Gadolinium Sulphate at the Boiling Point of 

 Liquid Hydrogen in Alternating Fields of Frequency 369,000 per second", p. 840. 



J. A. SCHOUTEN: "On a non-symmetrical affine field theory". (Communicated by Prof. H. A. 

 LORENTZ), p. 850. 



44 

 Proceedings Royal Acad. AmEterdam. Vol. XXVI. 



