CONTENTS. 



Alpha-automaticity (On the) of the autonomous organs. 152. 



Amylase of Aspergillus niger (The influence of hydrogen ion concentration 



upon the action of the). 6. 

 Anaphylaxis (Experiments on) with azoproteins. 34. 

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

 Antiphototropic curvatures (Further researches on the) occurring in the 



coleoptiles of Avena. 158. 

 Argon (A connection between the spectra of ionized potassium and). I. 67. 



— (On the mean free path of slow electrons in neon and). 90. 



— (On the excitation and ionization potentials of neon and). 179. Appen- 

 dix. 442. 



Arsenic (Determination of the vapour pressure of metallic). 387. 

 Aspergillus niger (The influence of hydrogen ion concentration upon the 



action of the amylase of). 6. 

 Atom (On Whittaker's quantum mechanism in the). 414. 

 Axes of rotation of quadratic surfaces through 4 given points. 52. 



— and planes of symmetry of quadratic surfaces of revolution through 5, 

 6 and 7 given points. 61. 



Azoproteins (Experiments on anaphylaxis with). 34. 



Bacillus polymyxa (On). 279. 



Backer (H. J.). The dissociation constants of sulphonacetic and z sul- 

 phonpropionic acids. 359. 



Bacteria (Concerning the synthetic action of) in the paunch of the cow. 482. 



Bacteriophagus of d'Herelle (Studies on the). 31. II. 87. III. 171. 



Baumstamm (Ueber einen fossilen) von Bolang (Java), ein Beitrag zur Kennt- 

 nis der fossilen Flora Niederlandisch-Indiens. 9. 



Bending-points (Abnormal strikes near the) of the horizontal projection of 

 the geanticlinal axis. 327. 



Beuerinck (M. W.) and L. E. den Dooren de Jong. On bacilhis poly- 

 myxa. 279. 



* 



Biscoumaric acids (The). 175. 



Blood (An objective method for determining the coagulation-time of). 127. 



Bloodvessels (On the significance of calcium- and potassiumions for the 



artificial oedema and for the lumen of the). 145. 

 Boeke (J.). On the regeneration of sensitive end-corpuscles after section 

 of the nerve. 319. 



32 

 Proceedings Royal Acad. Amsterdam. Vol. XXV. 



