vilt GON LEN Ts, 
Law (A new) concerning the relation of stimulus and effect. I. 341. IJ. 381. IIT. 469. 
LIMBURG (STARING and the coal-question of southern). 639. 
Lines (On the origin of double) in the spectrum of the chromosphere, due to ano- 
malous dispersion of the light from the photosphere. 193. 195, 
— (The number of conics intersecting eight given right). 181. 
— (Right) on surfaces with multiple right lines. 577. 
LIQUIDS (Expression of the equation of state of gases and) by means of series. 125. 
LOBRY DE BRUYN (C. A.) presents a paper of Dr. C. Prey: „Synthesis of trioxy- 
butyric acid (erythrie acid)”. 77. 
— presents a paper of G. VAN DER SLEEN: /On z-hydroxybutenoie acid (vinyl- 
glyeollie acid) and its decompositions”. 79. 
— presents a paper of Dr. N. ScHoorL: „Urea derivatives (carbamides) of 
sugars”. 214, 
— presents a paper Dr. J. J. BLANKSMA: /On the influence of different atoms and 
atomic groups on the conversion of aromatic sulphides into sulphones”. 264. 
— presents a paper of Dr. J. J. BLANKSMA: „On pentanitrophenylmethylnitramine 
and tetra- and pentanitrophenol”. 437. 
— presents a paper of Dr. J. J. BLANKSMA : /Bromination and nitration in the 
aromatic series”. 643. 
--- presents a paper of J. W. Dito: The densities of mixtures of hydrazine and 
water’. 756. 
LORENTZ (H. A.) presents a paper of Frep. Scuun: / Plane waves of light in an homo- 
geneous, electrically and magnetically anisotropic dielectric.” I. 49. IL. 148. 
— The rotation of the plane of polarization in moving media. 669. 
— The intensity of radiation and the motion of the earth. 678. 
— Some considerations on the principles of dynamics in connexion with IErtz’s 
Prinzipien der Mechanik. 713. 
LUMINOUS POINT (The relation between the brightness of a) and the moments at which 
we observe its sudden appearance or disappearance. 465. 
MAGNETIC ROTATION (he dispersion of the) of the plane of polarisation in negatively 
rotating salt-solutions. [l. Further measurements with potassium ferricyanide, 339, 
MAMMALS (On the gastrulation and the formation of the mesoblast in). 141. 
MANOMETER Of KAMERLINGH OnNES (Accuracy of the measurement of pressure by 
means of the open). 23. 
Mathematics. W. Kapreyn: /Special cases of Monce’s difterertial equation.” 21, 
— W. Kapreyn: vA definite integral containing Bessel’s functions.” 102. 
— K.) Bes’: „Analytical determination of the ninth point in which two curves of 
degree three, passing through eight given points, intersect each other.” 1C3. 
— L. GEGENBAUER: ”On the theory of the biquadratic rest.” 169. 
— Jan DE Vries: /The number of conics intersecting eight given right lines.” 181. 
— P. H. Scnovure: Considerations in reference to a configuration of SrGRE.” T. 
203. IL. 251. 
— 8. L. van Oss: „The elementary motion of space S,.” 218. 
— F, J. Vars: ,Factorisation of large numbers.” I, 326. Il. 425. III. 501, 
