IV CONTENTS. 



Chemistry. D. H. Bualns; "On a (•lyshillised d. frutose tetracelate". 563. 



— F. M. Jaeger: "On Ihe form-aniiIo<i:y of llalooene-derivatives of Hydrocarbones 

 with open chains". 623. 



— F. M. Jaeger: "On the Tripara-Halogen-substitution products of Triphenyl- 

 methane and Triphenylcarbonol." 789. 



— F. A. H. ScHREiNEMAKERS: "Equilibria in quaternary systems". 817. 



— B. W. VAN Eldik Thieme: "The action of concentrated sulphuric acid on 

 glycerol esters of saturated monobasic fatty acids". 855. 



CHROMOSOMES (On a double reduction of the number of) during the formation of the sexual 



cells and on a subsequent double fertilisation in some species of Polytrichum. 359. 

 CHYMOSIN (On the relation of pepsin to) 283. 



CINNAMIDE (Action of potassium hypochlorite on). 2n<i Communication. 308. 

 CLAY (j ), C. Braak and H. Kamehlingh Onnes. On the measurement of very low 



temperatures. XVII. Determinations for testing purposes with the hydrogen 



thermometer and the resistance thermometer. 422. 

 CLAY (j.) and H. Kamerlingh Onnes. On the measurement of very low temperatures. 



XV. Calibration of some platinum-resistance thermometers. 200. 



— On the change of the resistance of the metals at very low temperatures and the 

 influence exerted on it by small amounts of admixtures. 207. 



— Some remarks on the expansion of platinum at low temperatures. 342. 

 COMPONENT (The case that one) is a gas without cohesion with molecules which have 



extension. 231. 

 CONDENSATION of helium (Experiments on the) by expansion. 744. 

 CONFIGURATION of KüMMER (The extension of the) to spaces of (2p — I) dimensions. 263. 



— (The aualogon of the) in seven dimensional space. 503. 



CORPUS callosum (On the development of the) in the human brain. 344. 



CRITICAL POINT liquid-gas (On the equation of state of a substance in the neighbourhood 



of the). I. The disturbance function in the neighbourhood of the critical state. 603. 



II. Spectrophotoraetrical investigation of the opalescence of a substance in the 



neighbourhood of the critical state. 611. 

 CRITICAL STATE (Ecpetition of DE Heen's and Teichner's experiments on the). 215. 



— (The disturbance function in the neighbourhood of the). 603. 



— (Spectrophotoraetrical investigation of the opalescence of a substance in the 

 neighbourhood of the). 611. 



Crystallography. A. L. W, E. van der Veen: "The system of crystallization of the 

 diamond." 182. 



— J. ScHMUTZER: "About the oblique extinction of rhombic crystals". 368. 



— W. Voigt: "On the permissible orders of the axes of symmetry in crystallo- 

 graphy". 408. 



CYCLIC minimal surface (On the). 750. 



DEGENERATION (On ascending) after partial section of the spinal cord. 386. 

 DIAMOND (The system of crystallization of the). 182. 



DIGESTIVE TUBE (A method te extract enzymes and pro-enzymes from the mucous 

 membrane of the) and to establish the topic distribution of them. 250. 



