CONTENTS VII 



RoMBURGH (P VAN) and J. H. N. van der Burg. Cyclic derivatives of 

 mannitol. 335. 



RöNTGEN-RAYS (Research by means of) on the structure of the crystals of 

 lithium and some of its compounds with light elements. II. Lithium- 

 hydride. 27. 



— (On the difïraction of) in liquids. 118. 



RuTTEN (L.). Cuba, the Antilles and the Southern Moluccas. 263. 



Sand flow (Observations on the incandescent) of the valley of ten thousand 

 smokes. 42. 



ScHAAKE (G.). A new method for the solution of the problem of the 

 characteristics in the enumerative geometry. 113. 



ScHR EIN EM AKE RS (F. A. H.). In-, mono- and di variant equilibria. XXII. 341. 



Sjollema (B.). On the influence of the composition of the food on the 

 calcium output. 395. 

 . — and J. E. van der Zande. Changes in milk due to sterile inflam- 

 mation of the udder. 275. 



— and J. E. van der Zande. Concerning the synthetic action of bacteria 

 in the paunch of the cow. 482. 



Smedt (J. de) and W. H. Keesom. On the difïraction of Röntgen-rays in 

 liquids. 118. 



Smid Jr. (L. J.). Numbers of circles touching plane curves defined by 

 representation on point space. 221. 



Sodiumamide (The action of) on pyridine, and some properties of z-amino- 

 pyridine. 458. 



Sulphate-reduction (On the occurrence of) in the deeper layers of the 

 earth. 188. 



Sulphonacetic and a-sulphonnropionic acids (The dissociation constants 

 of). 359. 



Superposition (Explanation of some interference-curves of uni-axial and 

 bi-axial crystals by) of elliptic pencils. III. 81. 



Supra-orbital ridges (On the significance of the) in the primates. 16. 



Synthetic action of bacteria (Concerning the) in the paunch of the cow. 482. 



Ten thousand smokes (Observations on the incandescent sand flow of the 

 valley of). 42. 



Thallium (Measurements concerning the electric resistance of) in the temper- 

 ature field of liquid helium. 443. 



Thermodynamic quantities (The influence of a catalyst on the) regulating 

 the velocity of a reaction. 199. 



Thermodynamics (The magneto-thermic effect according to). 384. 



Thiel (E. VAN). The influence of a catalyst on the thermodynamic quanti- 

 ties regulating the velocity of a reaction. 199. 



Torpedo (A contribution to the physiology of the electrical organ of). 131. 



