CONTENTS. Ill 



Botany. M. Nieutyeniiuis- von Uexkïll-Güldenband : "On the harmful consequences 

 of the secretion of sugar with some myrmecophilous plants". 150. 



— VV. Burck : "On the influence of the nectaries and other sugar-containing 

 tissues in the llower on the opening of the anthers". 390. 



u a a a. k ( c. ) and 11. Kamerlingh Onnes. On the measurement of very low tem- 

 peratures. Xlll. Determinations with the hydrogen thermometer. 867. XIV. 

 Reduction of the readings of the hydrogen thermometer of constant volume to 

 the absolute scale. 775. 



— Isotherms of diatomic gases and their binary mixtures. VI. Isotherms of hy- 

 drogen between — 101°C and — 217°C. 754. 



bresk (On «-and fj-amyrin from). 471. 



H it o E k (a. j. p. v a N ü e n). On the relation of the genital ducts to the genital 



gland in marsupials. 396. 

 brouwer(l. e. j.). Polydimensional vectordistributions. 66. 



— The force held of the non-Euclidean spaces with negative curvature. 116. 



— The force held of the non-Euclidean spaces with positive curvature. 250. 

 burck ( w\ ). On the influence of the nectaries and other sugar-containing tissues 



in the llower on the opening of the anthers. 390. 



butyric ester of dihydrocholesterol, (On the anisotropous liquid phases of the) and 

 on the question as to the necessary presence of an ethylene double boud for 

 the occurrence of these phenomena. 701. 



cardiac action (An investigation on the quantitative relation between vagus stimu- 

 lation and). 590. 



cascade process (The preparation of liquid air by means of the). 177. 



cases (A few remarks concerning the method of the true and false). 222. 



catalytic reactions (On) connected with the transformation of yellow phosphorus 

 into the red modification. 613. 



cerebellar connections (Anatomical research about). 3rd Communication. 819. 



Chemistry. A. Smits: "On the introduction of the conception of the solubility of 

 metal ions with electromotive equilibrium." 2. 



— J. Moll van Charante: "The formation of salicylic acid from sodium pheno- 

 late." 20. 



— F. M. Jaeger: "On the crystal-forms of the 2.4 dinitroaniliue-derivatives, sub- 

 stituted in the NH,-group." 23. 



— J. J. van La.ui: "On the osmotic pressure of solutions of non-electrolytes, in 

 connection with the deviations from the laws of ideal gases." 53. 



— H. W. Bakhuis Roozeboom: "Three-phaselinea in chloralalcoholate andaniline- 

 hydrochloride." 99. 



— P. VAN ROMBURGH: "Triformiu (< i lyceryltrifnrmate)." 109. 



— P. van RoMBURGH and VV. van DoRSSEN: "On some derivatives of 1-3-5- 

 hexatriene." 111. 



— J. J. van Laar: "The shape of the spinodal and plaitpoint curves for binary 

 mixtures of normal substances. 4th Communication. The longitudinal plait." 226. 



— J. J. BlaNKSMA: "Nitration of nieta- substituted phenols." 278. 



60* 



