CONTENTS XXI 



RADIANT HEAT (Is there any Relation between the Capacity ot Odorous Substances of 

 Absorbing) and their iSraell-Intensity? 476. 



RADIATION-THEORY (Urease and the) of enzyme-action. 1126. II. 1307. 



RADIUM (Efl'ects of the Rays of) on the Oogenesis of Daphuia pulex. 540. 



RATU L A NG I -H o u TM A N (Mrs.) and 1. K. A. Wertheim Salomonson. Tonus 

 and faradic tetanus. 941. 



REEFGAPS (On) 816. 



refractometric Investigations (Eykman's), in Connection with the Presentation of 

 the Edition of his Wnrk^ 1200. 



restgases (Contribution to the knowledge of the removal of) especially for the 

 electric vacuum glow-lamp. 1063. 



r I E M a N n's measure of curvature (On the equivalent of parallel translation in non- 

 Euclidean space and on). 505. 



RIGID spheres (Deduction of the third virial coefficient for material points (eventually 

 for), which exert central forces on each other. 593. 



— (Development of the third virial coefficient for material points (eventually), which 

 exert central attracting forces on each other proportional with t — ^ or» — 6". 602. 



ROMBURGH (P. VAN) presents a paper of Dr. A. W. K. de Jong: "On the 

 estimation of the geraniol content of citronella oil". 576. 



— presents a paper of Dr. A. W. K. de Jong : "The heterocinnamic acids of 

 Erlenmeyer Jr.". 1(>48. 



RYNBERK (g. V A n) presents a paper of Dr. S de Boer : "On the influence of the 

 increase of the osmotic pressure of the fluids of the body on ditierent cell-sub- 

 strata". 151. 



SALOMONSON (l. K. A. W E R T H h 1 M) and Mfa. RaTU LaNGI— HoUTMAN. TouUS 



and faradic tetanus. 941. 



— The Limit of Sensitiveness in the String galvanometer. 235. 



— A new ophthalmoscope. 937. 



— The measurement of Chronaxia. 1152. 



SALTS (On the influence of some) on the dyeing of cellulose with Renzopurpurin 45. 893. 

 . SCHEFFER (f. e. c). On Phenyl Carbaminic Acid and its Homologues. 664. 



— On the Occurrence of Solid Substance in Binary Mixtures with Unmixing. I. 827. 



— On Metastable Unmixing and the Classification of Binary Systems. 1055. 



— and M. G. Meyeic. On an Indirect Analysis of Gas-Hydrates by a Thermodynamic 

 Method and Its .\pplicatioii to the Hydrate of Sulphuretted Hydrogen. I. 1204. 

 XII. 1338. 



SCHOUT E (c), F. A. VAN Heyst and N. E. üroeneveld Meyer: An instrument to 

 be used by the pilot of an aeroplane to measure the vertical velocity of the 

 machine. 468. 



schouten (j. A.). On the direct analyses of the linear quantities belonging to the 

 rotational group in three and four fuudamenlal variables. 327. 



— On the number of degrees of freedom of the geodetically moving system and 

 the enclosing euclidian space with the least possible number of dimensions. 607 . 



