CONTENTS. XI 



liquid phases (On the fatty esters of Cholesterol and Phytosterol, and on the aniso- 

 tropous) of the Cholesterol-derivatives. 78. 



— (On a substance which possesses numerous) of which three at least are stable in 

 regard to the isotropous liquid. 359. 



— (On a tetraconiponent system with two). 607. 



— (On the anisotropous) of the butyric ester of dihydrocholesterol, and on the 

 question as to the necessary presence of an ethylene double bond for the occur- 

 rence of these phenomena. 701. 



liquid state (On substances which possess more than one stable), and on the pheno- 

 mena observed in anisotropous liquids. 472. 



liquids (On substances which possess more than one stable liquid state, and on the 

 phenomena observed in anisotropous). 472. 



LONGITUDINAL PLAIT (The). 226. 



lorentz (h. a.) presents a paper of Dr. F. M. Jaeger : "Researches on the thermic 

 and electric conductivity power of crystallised conductors." I. 89. 



— presents a paper of J. J. van Laar: "The shape of the spinodal and plaitpoint 

 curves for binary mixtures of normal substances. 4th Communication. The longi- 

 tudinal plait." 226. 



— presents a paper of Dr. 0. Postma: "Some additional remarks on the quantity 

 H and Maxwell's distribution of velocities." 492. 



— presents a paper of Dr. J. H. Meebburg : "On the motion of a metal wire 

 through a piece of ice." 718. 



luminosity (The) of stars of different types of spectrum. 134. 



lupeol (On). 466. 



magnetic disturbances (On) as recorded at Batavia. 266. 



makt (On the formation of red blood-corpuscles in the placenta of the flying). 873. 



maksupials (On the relation of the genital ducts to the genital gland in). 396. 



Mathematics. L. E. J. Bbouwer: "Polydimensional vectordistributions." 66. 



— L. E. J. Bbouwer: "The force field of the non-Euclidean spaces with negative 

 curvature." 116. 



— Jan de Vries: "Quadratic complexes of revolution". 217. 



— L. E. J. Brouwer: "The force-field of the non-Euclidean spaces with positive 

 curvature." 250. 



— W. A. Versluys: "Second communication on the Thicker equivalents of a 

 cyclic point of a twisted curve". 364. 



— W. Kapteyn: "On a special class of homogeneous linear differential equations 

 of the second order." 406. 



— J. C. Kluyver: "Some formulae concerning the integers less than n and prime 

 to »." 408. 



— F. Schuh: "On the locus of the pairs of common points and the envelope of 

 the common chords of the curves of three pencils." 1st part. 424. 2nd part. 548. 



— W. A. Wythoff: "The rule of Neper in the fourdimensional space." 529. 



— P. H. Schoute: "The locus of the cusps of a threefold infinite linear system 

 of plane cubics with six basepoints". 534. 



