XYin C o N T E N T S. 



IV. Isothermals of pure carbon dioxide between 25° C. and 60° C, and between 

 60 and 140 atmospheres. 565. V. Isothermals of mixtures of the molecular com- 

 positions 0.1U47 and 0.1994 of oxygen, and the comparison of them with those 

 of pure carbon dioxide. 577. VI. lutiuence of gravitation on the phenomena 

 in the neighbourhood of the plaitpoint for binary mixtures. 593. 



OXYGEN (Isothermals of mixtures of the molecular compositions 0.1047 and 0.1994 of), 

 and the comparison of them with those of pure carbon dioxide. 577. 



r A N N E K o E K (a.). Some remarks on the reversibility of molecular motions. 42. 



p E K E L H A B I N G (c A.) presents a paper of Dr. M. C. Dekhuyzen and P. Vermaat: 

 "On the epithelium of the surface of the stomach." 30. 



— presents a paper of Dr. E. 0. Hebzog : "On the action of Emulsin." 332. 

 pentacetates (The mutual transformation of the two stereoisomeric) of r/- glucose. 779. 

 PEKiouiciTY (The) of solar phenomena and the corresponding periodicity in the 



variations of meteorological and earth-magnetic elements, explained by the 



dispersion of light. 270. 

 phases (Theoretical consideration concerning boundary reactions which decline in 



two or more successive). 846. 

 PHENOMENA of soHdification (The) and transformation in the systems NII4NO3, AgNOg 



and KNO3, AgNOs- 259. 

 PHOCA viTULiNA (The foetal membrane and the placenta of). 610. 

 PHOSPHORUS (The action of) on hydrazine. 1. 

 PHYLA (On the relationship of various invertebrate). 839. 

 Physics. P. Zeeman and J. Geest : "On the double refraction in a magnetic field near 



the components of a quadruplet." 19. 



— A. Pannekoek : "Some remarks on the reversibility of molecular motions." 42. 



— J. E. Verschaffelt : "Contributions to the knowledge of van der Waals 

 \I(-surface. VII. The ec[uations of state and the vj^-surface in the immediate neigh- 

 bourhood of the critical state for binary mixtures with a small proportion of one 

 of the components, (part 3). 59. (part 4). 115. VIII. The Jz-surface in the neigh- 

 bourhood of a binary mixture whicli behaves as a pure substance. 649. 



— J. D. VAN DER Waals : "The liquid state and the equation of condition." 123. 

 -^ J. D. VAN DER Waals : "The equilibrium between a solid body and a fluid 



phase, especially in the neighbourhood of the critical state." 230. 2nd part. 357. 



— W. H. Julius : "The periodicity of solar phenomena and the correspondin"- 

 periodicity in the variations of meteorological and earth-magnetic elements, 

 explained l)y the dispersion of light." 270. 



— J. P. KuENEN : "'On the critical mixing-point of the two liquids." 387. 



— G. VAN DiJK and J. Kunst : „A determination of the electrochemical equivalent 

 of silver." 441. 



— C. H. Brinkman : "The determination of tlie ])ressure with \\ closed airmano- 

 meter." 510. 



