CONTENTS XIX 



STOK {J. P. VAN D E r) |)resent3 a paper of Miss Annie van Vleuten: "Do 

 the forces causing the diurnnl variation of terrestrial magnetism possess a 

 potential?'' 358. 



— presents a paper of Miss Annie van Vleuten : "On the question whether th« 

 internal magnetic field, to which the diurnal variation in terrestrial magnetism is 

 partly ascribed, depends on induced currents". 361. 



— presents a paper of Dr. C. Easton : "Periodicity of wintertemperatures in 

 Western- Europe, since A. D. 760". 1092. 



STORM VAN LEEUWEN (W.). V. LeEUWEN (W. StORM VAN). 



SUCROSE (Influence of diff"erent compounds on the destruction of monosaccharids 

 bij sodiurahydroxide and on the inversion of) by hydrochloric acid. 88. II. 

 382. III. 581. 



sulfanilic acid (Constitution-formula of the hydroxybenzoic acids and of). 581. 



SULPHUR MOLECULE (A third kind of). 824. 



SURFACES that may be represented in a plane by a linear congruence of rays. 419. 



— (Elementary) of the third order. 101. 2nd communication 304. 3rd communication. 

 736. 4th communication. 1246. 



SYNBRANCHIDAE (The fore-brain of). 217. 



SYSTEM : hexaue-nitrobenzene (The boiling point line of the). 322. 



T E M M 1 N C K G B, O L L (j.). v. GroLL (J. TeMMINCK). 



TEMPERATURE (The influence of the) on the extinction; further experiments upon the 



influence of the magnetic field. 210. 

 TEMPERATURES (On the measurement of very low). XXVII. 991. 1155. XXVIII. 1163. 



— (The specific heat at low). IV. Measurements of the specific heat of liquid 

 hydrogen. 1000. 



Terrestrial Magnetism. Miss. Annie van Vleuten: "Do the forces causing the diurnal 

 variation of terrestrial magnetism possess a potential?" 358. 



— Miss Annie van Vleuten: "On the question whether the internal magnetic 

 field, to which the diurnal variation in terrestrial magnetism is partly ascribed, 

 depends on induced currents". 361. 



thermopile (The use of the) of. Dr. W. M. Moll for absolute measurements. 566. 

 transmutation (Some considerations on complete). 3rd Communication. 449. 4t.h 



Communication. 609. 5th Communication. 893. 6th Communication. 910, 7th 



Communication. 924. 

 TREUB (j. p.). On the Saponification of fats. I. 35. II. 343. 

 TRlETUYLlNEüiAMiNE ziNC-CHLORiUE (Some isomeric, complex cis- and trans-dietliyleue- 



diaraine Salts of cobaltum, and on). 292. 

 T R I G T (h. van), a contribution to the physiology of the fresh-water Sponges (Spon- 



gillidae). 1061. 

 TRUXlLLic ACIDS (Structure of). 590. 

 ULTEAMiCROscopio INVESTIGATION of very thiu metalfilms obtained by evaporation in 



high vacuum. 1135. 

 UBANlUM-HEART (On the hehaviour of the) towards electric stimulation, as investigated 



bv Mr. M. den Boek. 189. 



