Il CONTENTS 



Astronomy. E. Hertzsprung; "On the magnitude equation of Osthoff's 



estimates of star-colours". 12. 

 Atomic structure (Nitrogen fixation by means of the cyanide-process and). 480. 

 Backer (H. J.). The second dissociation constant of sulphoacetic and 



z-sulphopropionic acids. 83. 



— and J. H. de Boer. n. x-Sulfobutyric acid and its optically active 

 components. 79. 



Bacteria (The splitting of lipoids by). 1. 436. 



Bactéries vivantes (Culture du bacteriophage sans intervention de). 486. 

 Bacteriology. P. C. Flu: "On the bacteriophage and the self-purification 

 of water". 116. 



— G. M. Kraay and L. K. Wolff: "The splitting of lipoids by bacteria". 

 I. 436. 



— F. d'Herelle: "Culture du bacteriophage sans intervention de bacté- 

 ries vivantes". 486. 



Bacteriophage (On the) and the self-purification of water. 116. 

 Bacteriophage (Culture du) sans intervention de bactéries vivantes. 486. 

 Balance-pressure (The influence of rotation on the sensitiveness and the 



accuracy of a). 805. 

 Bannier (J. P.). Cytological investigations on apogamy in some elementary 



species of Erophila verna. 349. 

 Barenne (J. G. Dusser de) and J. B. Zvvaardemaker. On the influence 



of the vagi on the frequency of the action currents of the diaphragm 



during its respiratory movements. 771. 

 Beaufort (L. F. d e) and H. A. Brouwer. On tertiary marine deposits with 



fossil fishes from South Celebes. 159. 

 Belinfante (M. J.). A generalisation of Mertens' theorem. 203. 



— On a generalisation of Tauber's theorem concerning power series. 216. 



— On power series of the form: x"" — x''i-\-x''-^ — ... 456. 

 Bergius" method (Hydrogenation of parafün by the). 226. 



Biezen O (C. B.). An application of the theory of integral equations on 



the determination of the elastic curve of a beam, elastically supported 



on its whole length. 237. 

 Bilinearformen (Ueber Invarianten von). 801. 

 Biochemistry. J. R. Katz: "Further researches on the antagonism between 



citrate and calcium salt in biochemical processes, examined by the 



aid of substituted citrates". 1. 542. 



— B. Sjollema and Miss J. E. van der Zande: "Researches on the 

 metabolism of milch-cows suffering from acetonemia". 666. 



Birds (The ontogenetic development of the corpus striatum in) and a com- 

 parison with maminals and man. 135. 



