XVni CONTENTS. 



TESCH (p.). Considerations on the Staringiaii "Z;inddiluviunr\ 108. 



THEOREM of Grassmann (The) in a space of n dimensions. 271. 



THEORY of binary mixtures (Contribution to the). IV. 56. V. 123. VI. 183. 



— of Jupiter's satellites (On some points in the). 95. 



THERMOMETER (Determinations for testing purposes with the hydrogen thermometer and 

 the resistance). 422. 



THERMOMETER (The determination of the absolute zero according to the hydrogen) 

 of constant volume and the reduction of the readings on the normal hydrogen 

 thermometer to the absolute scale. 429. 



— (Derivation of the pressure coefficient of helium for the international helium) 

 and the reduction of the readings on the helium thermometer to the absolute 

 scale. 589. 



— (Influence of the deviations from the law of Boïle-Charles on the temperature 

 measured on the scale of the gas-) of constant volume according to observations 

 with this apparatus. 743. 



thermometers (Calibration of some platinum-resistance). 200. 

 TRICHECHIDS (On fossil) from Zealand and Belgium. 2. 

 trigonometrical series (On the multiplication ofj. 558. 



TRi-PARA-HALOGEN-suBSTiTUTioN PRODUCTS (On the) of Triphenylmcthane and Triphe- 

 nylcarbinol. 789. 



TRIPHENYLMETHANE and Triphenylcarbinol (On the Tri-para-Halogene-substitution pro- 

 ducts of). 789. 

 TRIPLETS (New observations concerning asymmetrical). 566. 



— (Change of wavelength of the middle line of). 574. 2nd part. 862. 

 TWISTED CORVES (On) of genus two. 832. 



— (On algebraic) on scrolls of order n with {n — l)-fold right line. 837. 



VEEN (a, l. w. e. van d e r). The system of crystallization of the diamond. 182. 



VERTEBRATES (On the Segmental skin-innervation by the sympathetic nervous system 

 in), based on experimental researches about the innervation of the pigment-cells 

 in flat fishes and of the pilo-raotor muscles in cats. 332. 



voiGT (w.). On the permissible orders of the axes of symmetry in crystallography. 408. 



vosMAER (G. c. J.) presents a paper of Dr. J. Eoeke: "On the structure of the 

 nervecells in the central nervous system of Eranchiostomalanceolatum". 1st Com- 

 munication. 86. 



— presents a paper of Dr. J. Boeke and G. J. de Groot; "Physiological regene- 

 ration of neurofibrillar endnets (tactile discs) in the organ of Eimer in the mole". 452. 



VRIES (jan de) presents a paper of Dr. Z. P. Bouman : "Contribution to the 

 knowledge of the surfaces with constant mean curvature". 545. 



— On twisted curves of genus two. 832. 



— On algebraic twisted curves on scrolls of order m with (« — l)-fold right line. 837. 

 WAALS (van der) (Contribution to the 4*-surface of). XV. The case that one 



component is a gas without cohesion with molecules which have extension. Limit- 

 ed miscibility of two gases. 2Qd Continuation. 231. XVT. On the gasphase sinking 



