CONTENTS. \'l 



SCHOUTE (P. U.). On the cyclographic space representation of Joachimsthal's circles. 1. 



— A geometriciil interpretation of the invariant n (ff/^)" of a binary form a"" ot 



"+1 

 even degree, o 13. 



SCHREI NEMAKERS (F. A. H.). Equilibriums in systems of three components. Change 

 of the mixing-temperature of binary-mixtures by the addition of a third com- 

 ponent. 191. 



SCREWS of Ball (The representation of the) passing through a point or lying in a 

 phme, according to the method of Caporali. 25 S. 



SIERTSEMA (l. 11.). Measurements on the magnetic rotatory dispersion of gases. 

 243. 296. 



SOLUBILITÏ (On) and meltiugpoint as criteria for distinguishing racemic combination?; 

 pseudoracemic mixed crystals and inactive conglomerates. 310. 



SOLUTIONS OF SALTS (On the influence of) in the volume of anima Icells. 26. 103. 371. 



SOURCE OF LIGHT (On the influence of the dimensions of the) in diffraction phenomena 

 of Fresxel and on the difi'raction of X-rays. 65. 



SPECTRAL LINES of irou (On an asymmetry in the change of the) radiating in a mag- 

 netic field. 27. 98. 



SPOTDISEASE of the Tobacco-leaves (On a Contagiura vivum fluiJuni causing the). 170. 



s p R Ü Y T (c. bellaar). On the physiological action of metliylnitramine in con- 

 nection with its chemical constitution. 321. 



STANDARD OPEN MANOMETER (A) of reduced height with transference of pressure l)y 

 means of compressed gas. 154. 213. 



STEGER (a.). The rate of substitution of a nitrogroup by an oxalkyl. 144. 



stokes' Theory of aberration in the supposition of a variable density of the 

 ether. 323. 443. 



STOKVIS (b. J.) presents the dissertation of Dr. C. Bellaar Spruyt: //On the 

 physiological action of metliylnitramine in connection with its chemical consti- 

 tution." 321. 



SUBSTANCES (The condition of) insoluble in water formed in gelatine. 39. 



— (On congealing- and melting-phenomena in) showing tautomerism. 176. 



— (The- equilibrium of systems of three), in which two liquids occur. 253. 



— (Simple deduction of the characteristic equation for) with extended and com- 

 posite molecules. 13S. ■ ■ 



SUBSTITUTION (The rate of) of a nitrogroup by an oxalkyl. 144. 

 SYSTEMS (On a simplified theory of the electrical and optical phenomena in moving). 

 323. 427. 



— OF coNics (On the orthoptical circles belonging to linear). 305. 



— OF OPTIC ISOMERS (On melting points in). 466. 



TARsius (Haematopoiesis in the placenta of) and other mammals. 167i 

 TAUTOMERISM (On Congealing- and melting-phenomena in substances showing). 176. 

 THALLIUM (On mixed crystals of nitrate of kalium and nitrate of). 229. 

 THEORY (On a simplified) of the electrical and optical phenomena in moving systems. 

 323. 427. 



— (Stokes') of aberration in the supposition of a variable density of the ether. 

 323. 443. 



