CONTENTS XXV 
TREUB (J. P.) and F. 1. C. Scuerrer. Determinations of the vapour tension of 
nitrogen tetroxide. 166, 
TRIGT (H. VAN) and W. E. Rineer. Influence of the reaction upon the action of 
ptyalin. 799. 
TRUNKDERMATOME (Form and function of the) tested by the strychnine-segmentzones, 740. 
TWISTED CUBICS (On a line complex determined by two). 922. 
TWISTED CURVE (On loci, congruences and focal systems deduced from a) and a 
twisted biquadratie curve. I. 495. IT. 712. III. 890. 
TWISTED CURVES (On metric properties of biquadratic). 910. 
TWISTED QUARTIC cURVE (On the correspondence of the pairs of points separated 
harmonically by a). 918. 
TYROSINASE (On the composition of) from two enzymes. 932. 
UVEN (M. J. VAN). Homogeneous linear differential equations of order two with 
given relation between two particular integrals. 5th. Communication. 2. 
VALKENBURG (C T. vAN) On the occurrence of a monkey-slit in man. 1040. 
vapours (Electric double refraction in some artificial clouds and). 178. 
VAPOUR-PRESSURE lines (On) of the binary systems with widely divergent values of 
the vapour pressures of the components. 96. . 
VAPOUR TENSION (Determinations of the) of nitrogen tetroxide. 166. 
VELOCITIES of reaction (On) and Equilibria, 1109. 
veLOCITY of light (A proof of the constancy of the). 1299. 
VELOCITY of substitutions (On the) in the benzene nucleus. 1118. 
VERSLUIJS (W. A.). On a class of surfaces with algebraic asymptotic curves. 1363. 
VERTEBRAL COLUMN of man (Contributions to the knowledge of the development of). 80. 
VIRIAL-COEFFICIENT (On the deduction of BoLTZMANN’s entropy principle of the second) 
for material particles (in the limit-rigid spheres of central symmetry) which 
exert central forces upon each other and for rigid spheres of central symmetry 
containing an electric doublet at their centre. 256. 
— (On the second) for diatomic gases. 417. 
— (On the second) for monatomic gases, and for hydrogen below the BoyLe-point. 643. 
VISION (On localised atrophy in the lateral geniculate body causing quadrantic hemi- 
nopsia of both the right lower fields of). 840. 
viscosity of gases (Investigations on the) at low temperatures. I. Hydrogen. 1386. 
II. Helium. [1I. Comparison of the results with the law of corresponding states. 
1399. 
VRIES (G. DE). Calculus rationum. 2nd. part. 64, 
VRIES (HK. DE). On loci, congruences and focal systems deduced from a twisted 
curve and a twisted biquadratic curve I. 495. IL. 712. III. 890. 
VRIES (JAN DE) presents a paper of Dr. G. pe Vries: “Calculus rationum”. 2nd, 
part. 64, 
— On metric properties of biquadratic twisted curves. 910. 
— On the correspondence of the pavis of points separated harmonically by a 
twisted quartic curve. 918. 
— On a line complex determined by two twisted cubics. 922, 
