XII CON T EEN TS. 
KORTEWEG (pb. J.) presents a paper of Dr. L. E. J. Brouwer. “On looping 
coefficients”, 113. 
KRUYT (H. R.). The dynamic allotropy of sulphur. 5th Communication. 1228. 
— The influence of surface-active substances on the stability of suspensoids. 1344. 
KUENEN (J. P.). The coefficient of diffusion for gases according to O. E. Meier. 1152. 
LAAR (J. J. VAN). The calculation of the thermodynamic potential of mixtures when 
a combination can take place between the components. 614. 
LANGE (s. DE) and W. Reinpers. The system Tin-Iodine. 474. 
LATERAL BRANCHING (Dichotomy and) in the Pteropsida. 710. 
Law (On the) of the partition of energy. 1175. II. 1355. 
— of corresponding states (The) for different substances. 971. 
LEEUW (H. L. DE). On the relation between sulphur modifications. 554. 
—, A. Smits and J. W. Terwen. On the system phosphorus. 885. 
— and A. Smits. The system tin. 676. 
LELY JR. (D.) and W. Reinpers, The distribution of dyestuffs between two solvents. 
Contribution to the theory of dyeing. 482. 
LEUCITE-ROCKS of the Ringgit (East-Java) and their contact metamorphosis. 1238. 
ticut (On the polarisation impressed upon) by traversing the slit of a spectroscope 
and some errors resulting therefrom. 599. 
— (A proof of the constancy of the velocity of). 1297. 
LINE COMPLEX (On a) determined by two twisted cubics, 922, 
LINE SPECTRA (Translation series in). 156. 
LINNEAN METHOD (The) of describing anatomical structures. 620. 
LIPASE (Influence of some inorganic salts on the action of the) of the pancreas. 336. 
LIguips (Monotropy and enantiotropy for). 361. 
—- (Experimental investigations concerning the miscibility of) at pressures to 3000 
atmospheres. 1021. 
— (On the behaviour of gels towards) and their vapours. 1078. 
LITHIUM-LINE (The red). 1130. 
LIVER (On the occurrence of metals in the). 850. 
Loci (On), congruences and focal systems deduced from a twisted cubic and a twisted 
biquadratie curve. I. 495. IL. 712. III. 890. 
LOHUIZEN (7. VAN). Series in the spectra of Tin and Antimony. 31. 
— Translation series in line spectra. 156 
LORENTZ (H. A.) presents a paper of Dr. L. S. Ornstein: “Accidental deviations 
of density in mixtures”. 54. 
— presents a paper of Mr. J. J. van Laar: “The calculation of the thermodynamic 
potential of mixtures when a combination can take place between the components” 614 
— presents a paper of Dr. L. 8. Ornsrern: “On the thermodynamical functions for 
mixtures of reacting components’. 1100. 
— presents a paper of Prof. P. Enrenrest: “On Einstein's theory of the stationary 
gravitation field”. 1187. 
— presents a paper of Dr. L. S. Ornstein: “The diffraction of electromagnetic 
waves by a crystal”. 1271. 
