CONTENTS. XIX 



SPECTKOGRAPUS (Keport on tlie operations with the two slit-) for the solar eclipse of 



August 30, 1905. 506. 

 SPICULES of sponges (On the structure of some siliceous). I. The styli of Tethya 



lyncuriuiTi. 15. 

 SPINODAL and the plaitpoint lines (On tlie course of the) for binary mixtures of 



normal substances. 3i'd communication. 578. 

 SPONGES (On the structure of some siliceous spicules of). I. Tlie styli of Tethya 



lyncuriiim. 15. 

 ST. DENIS (Island of Kéuuion) (Supplement to the account of the determination of 



the longitude of), executed in IST-i, containing also a general account of the 



observation of the transit of Venus. 110. 

 STEMS and flower-stalks (Some observations on the longitudinal growth of). 8. 

 STILBENE and Dibenzyl (On Diphenylhydrazine, Hydrazobenzene and Benzylaniline, 



and oil the miscibility of the last two with Azobenzene) in the solid aggregate 



condition. 466. 

 STOK (j. p. VAN D E h). On frequency curves of meteorological elements. 314. 



— On frequency curves of barometric heights. 549. 



s T R A II L (h.). The uterus of Erinaceus europaeus L. after parturition. S12. 

 STRING (Mass and tension of the quartz wire and resistance to the motion of the). 210. 

 SUBSTANCES (On the hidden equilibria in the jB,.r-diagrara of a binary system in conse- 

 quence of the appearence of solid). 196. 



— (Contribution to the knowledge of the |;,,r-and the 2>,T- lines for the case that 

 two) enter into a combination which is dissociated in the liquid and the gasphase. 200. 



SURFACE (A tortuous) of order six and of genus zero in spacefi);, of four dimensions. 498. 

 i),-sURFACE (Contributions to the knowledge of van der Waals'). X. On the possibi- 

 lity of predicting the properties of mixtures from those of the components. 743. 

 suitFACE OF SATURATION (The shape of the sections of the) normal to the a'-axis, in case 



of a three phase pressure between two temperatures. 184. 

 SURFACE OF SATURATION (Tlie properties ot the sections of the) of a binary mixture 



on the side of the components. 280. 

 SURFACES (A particular series of quadratic) with eight commou points and eight 



common tangential planes. 754. 

 SURINAM (An enumeration of the vascular plants known from) together with their 



distribution and synonymy. G39. 

 TANGENTS (On the number of common) of a curve and a surface. 176. 

 TARSius SPECTRUM (On the primordial cranium of). 397. 

 TEETH-FORMULAS (On the relation between the) of the platyrrliine and catarrhine 



primates. 781. 

 TEMPERATURE (The molecular rise of the lower critical) of a binary mixture of normal 



components. 144. 



— (On the radiation of heat in a system of bodies having a uniform). 401. 

 TEMPERATURES (The shapB of the sections of the surface of saturation normal to the 



^c-axis, in case of a three phase pressure between two). 184. 



— below — 210° C. (Cryostat with liquid oxygen for). 79. 



