CONTENTS. XVII 



siRKS (ii. a.) and A. F. Holleman. The six isomeric dinitrobenzoic acids. 280. 

 SMITS (a.). On the introduction of the conception of the solubility of metal ions 

 with electromotive equilibrium. 2. 



— On the course of the P, '/'-curves for constant concentration for the equilibrium 

 solid-fluid. 9. 



sodium PHENOLATr; (The formation of salicylic acid from). 20. 



solar eclipse (Observations of the total) of August 30, 1905 at Tortosa (Spain). 45. 

 solubility of metal ions (On the introduction of the) with electromotive equilibrium. 2. 

 solutions of non-electrolytes (On the osmotic pressure of), in connection with the 



deviations from the laws of ideal gases. 53. 

 space (The rule of Neper in the fourdimensional). 529. 

 spaces (The force field of the non-Euclidean) with negative curvature. 116. 



— with positive curvature. 250. 



spectra (The relation between the) and the colours of the stars. 292. 



— (An investigation of some ultra-red metallic). 544. 

 spectral formula (On a new empiric). 434. 



spectrum (The luminosity of stars of different types of). 134. 



— (Wave-lengths of formerly observed emission and absorption bands in the infra- 

 red). 706. 



spinodal and plaitpoint curves (The shape of the) for binary mixtures of normal 

 substances. 4th Communication. The longitudinal plait. 226. 



spronck (c H. H.) presents a paper of H. Eysbroek : "On the Amboceptors of 

 an anti-streptococcus serum". 336. 



— presents a paper of P. Nieuwenhuyse : "On the origin of pulmonary Anthra- 

 cosis". 673. 



stars (The luminosity of) of different types of spectrum. 134. 



— (The relation between the spectra and the colours of the). 292. 



stein (j.). Observations of the total solar eclipse of August 30, 1905 at Tortosa 



(Spain). 45. 

 stok (j. p. van der). The treatment of wind-observations. 684. 

 sugar (On the harmful consequences of the secretion of) with some myrmecophilous 



plants. 150. 

 ^-surface for binary mixtures (A remark on the theory of the). 524. 



— of van der Waals (Contributions to the knowledge of the). XI. A gas that 

 sinks in a liquid. 459. XII. On the gas phase sinking in the liquid phase for 

 binary mixtures. 501. XIII. On the conditions for the sinking and again rising 

 of the gas phase in the liquid phase for binary mixtures. 508. Continued. 660. 

 XIV. Graphical deduction of the results of Kuenen's experiments on mixtures 

 of ethane and nitrous oxide. 664. XV. The case that one component is a gas 

 without cohesion with molecules that have extension. Limited miscibility ofgases. 786. 



temperature (How to obtain baths of constant and uniform) by means of liquid 

 hydrogen. 156. 



— in the atmosphere (On the astronomical refractions corresponding to a distribu- 

 tion of the) derived from balloon ascents. 578. 



