KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 



of Saturday June 26, 1915. 



Vol. XVIII. 



President: Prof. H. A. Lorentz. 

 Secretary: Prof. P. Zeeman. 



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

 Natuurkundige Afdeeiing van Zaterdag 26 Juni 1915, Dl. XXIV). 



CONTENTS. 



H A I ORENTZ- "The width of spectral lines", p. 134. 



W REINDERS and F. GOUDRIAAN: "Equilibria in the system Cu-S-0 ; the roastmg reacfon process 



' with copper." (Communicated by Prol. S. HOOOEWERFF), p. 150. 

 H 7\i;a4RnFMAKER- "On measurement of sound", p. 165. 

 Ë; HBÜCHNER "The viscosity of colloidal solutions." (Communicated by Prof. A. F. HOLLEMAN), 



P. e'hrenfest-. «Some Remarks on the Capillarity Theory of the Crystalline Form". (Communicated 



by Prof. H. A. Lorentz), p. 173. 

 A W K DE lONO: 'Action of sun-light on the cinnamic acids , p. 181. 

 J J VAN LAAR: "Some Remarks on the Osmotic Pressure". (Commucicated by Prol. H. A. Lorentz), 



]. a''].' barge: "On the metamerologic.il signific.ition of Ihe craniovertebral interv.il." (Communi- 

 cated by Prof. L. BOLK), p. 191. . , i, . p,„( 

 J. A.J. BARGE: "The genetical signification of some atUis-varuitions". (Communicited by Prof. 



L. BOLK), p. 201. 

 A WiCHMANN: "On phosphorite of the isle of Ajawi , p. 214. 

 W and I DOCTERS VAN LEEUV^EN-REIJNVAAN: "On the germination of the seeds of some Javanese 



■ Loranthaceae". (Communicated by Prof. F. A. F. C. WENT), p^220. 



S. DE BOER: "On the heart-rhythm". IV. Heart-ilternation (Communicated by Prof. J. K. A. 



WERTHEIM SALOMONSON), p. 231. . 



W EINTHOVEN F. L. BERGANSIUS and J. BlJTEL : "Upon the simultaneous registration of electric 



phenomena by means of two or more galvanometers, and upon its application to electro- 



P WE'issTnd"Miss''E.^D.' BRUINS: "The magnetic susceptibility and the number of m.ignetons of 

 nickel in solutions of nickelsalts", (Communicated by Prof. H. A. LORENTZ), p. 246. 



P WEISS and Miss C. A. Frankamp: "Magneto-chemical researches on ferrous salts in solution , 

 (Communicated by Prof. H. A. LORENTZ), p. 254. ^ ■ . „ ,r 



Miss H J VAN LUTSENBURO MAAS and Q. VAN ITERSON Jr.: "A microsaccharimeter . (Communi- 

 cated bv Prof. M. W. BEIJERINCK), p. 258. (With one plate). ^ ., , , 



F M JAEGER and JUL. KAHN: "Investigations on the Temperature-Coefficients of the Free Molecular 

 Surface-Energy of Liquids between -80= and 1650= C. X. Measurements Relating to a Series 



F. M.^AEQEra^d°j"rK'AHN':''lbirxi. "The Surface-Tension of homologous Triglycerides of the 



F iJ'uEOEfand''j^L''KAHN: Ibid Xll. "The Surface-Energy of the Isotropous and Anisotropous 



■ Liquid Phases of some Aromatic Azoxy-Compounds and of Anisaldazine , p. 297. 



M W BEIIERINCK: "Crystallysed St.irch", p. 305. (With one plate). ., ., , .^ 



Tp VAN DER STOK: "On the relation between meteorological conditions in the Netherlands and 



some circumjacent places. Atmospheric Pressure", p. 310. .,,.„,.,,, , 



I P VAN DER stok: "On the relation between meteorological conditions in the Net.ierlands and 



some circumjacent places. Difference of atmospheric pressure and wind", p. 321. 



Proceedings Royal Acad. Amsterdam. Vol. XVUl. 



