XVI C o N T E N T S. 



SANDE BAKUUYZEN (e. p. VAN de) prcseiits a paper of Dr. W. de Sitter: 



"On some points in the theory of Jupiter's satellites". 95. 

 SANDE BAKHUvzEN (h. g. VAN D e) presents a paper of Dr. J. Stein : "|3 



Lyrae as a double star". 459. 



— The height of the mean sea-level in the Y before Amsterdam from 1700—1860. 703. 

 SATELLITES (On some points in the theory of Jupiter's). 95. 



— (On the masses and elements of Jupiter's) and the mass of the system. 653. 



Continued. 710. 

 SCHALIE, Lei and Schist (On the terms). 432. 



SCHIST (On the terms Schalie, Lei and). 432. 



SCHMUTZER (j.). About the oblique extinction of rhombic crystals. 368. 



— On the terms Schalie, Lei and Schist. 432. 



SCHOUTE (p. H.) presents a paper of Lucien Godeaux: "The theorem of Grass 

 MANN in a space of n dimensions". 271. 



— The section of the measure-polytope Mn of space Spn with a central space 

 Sj)n—l perpendicular to a diagonal. 485. 



Fourdimensional nets and their sections by spaces. 1st part. 536. 2ncl part. 636. 



— The sections of the net of measure polytopes Mn of space Sj)7i with a space 

 Spn—\ normal to a diagonal. 088. 



SCHOUTE (p. H.) and Mrs. A. Boole Stott. On five pairs of four- dimensional cells 



derived from one and the same source. 499. 

 SCHKEINEMAKERS (f. A. u.). Equilibria in quaternary systems. 817. 

 scrolls of order n (On algebraic twisted curves ou) with (w — 1) fold right line. 837. 

 sea-level (The height of the mean) in the Y before Amsterdam from 1700 — 1860. 703. 

 SELF induction (The value of the) according to the electron-theory. 850. 

 sexual CELLS (On a double reduction of the number of chromosomes during the 



formation of the) and on a subsequent double fertilisation in some species of 



Polytrichum. 359. 

 SITTER (w. D e). On periodic orbits of the type Hestia. 47. 



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



— On the masses and elements of Jupiter's satellites and the mass of the system. 

 653. Continued. 710. 



skin-innervation (On the segmental) by the sympathetic nervous system in verte- 

 brates, based on experimental researches about the innervation of the pigment- 

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



SMELL of muscon (On the adsorption of the) by surfaces of difierent material. 116. 

 Continued. 120. 



SOLAR system (On the mean star density at difierent distances from the). 626. 



spectral apparatus (On auto-collimating) of great luminous intensity. 729. 



SPECTRAL LINES (The intensities of the components of) divided by magnetism. 289. 



— (Magnetic revolution ofj and magnetic force. 2nd part. 351. 



— (Observations of the magnetic resolution of) by means of the method of Fabry 

 and Perot. 440. 



