CONTENTS. SVit 



PEKELHABTNG (c. A.) presents a paper of Mr. N. Waterman: "Further expe- 

 rimental investigations of tlie internal secretion of the pancreas". 248. 



— presents a paper of Mr. iS. de Boer : "On the reflectorical influence of the 

 thoracal autonomical nervous system on the rigor mortis in cold-blooded ani- 

 mals". 952. 



PERKIER (alb.) and II. Kamerlingh Onnes. Magnetic researches. X. Apparatus 

 for the general cryomagnetic investiji^ation of substances of small susceptibilitv. 

 G89. 786. XII. The susceptibility of solid oxygen in two forms. S94. Xlll. The 

 susceptibility of liquid mixtures of oxygen and nitrogen and the inlliiencc of the 

 mutual distance of the molecules upon paramagnetism. 901. 



P E s K I (a. j. V a n). On a new method of preparing carboxylic anhydrides. 969. 



PHASE RULE (Collolds and the). 6U. 



PHOSPHORUS (On the vapour pressure lines of the system). I. 1174. 



PHOSPHORUS and cyane (The systems). 27. 



PHOTO-GROWTH REACTION (The primary) and tlie cause of the positive ])hototropism in 

 Phycomyces nitens. 774. 



PHOTOTROPiSM (The primary photo-growth reaction and the cause of the positive) in 

 Phycomyces nitens. 774. 



PHOTOTROPY (Positive and negative) of the apex and base in oat-seedlings (Avena 

 sativa). 363. 



PHOTOSPHERIC PHENOMENA (On the interpretation of). 264. 



PHTHALIC ANHYDRIDE. 712. 



PHYCOMYCES NITENS (The primary photo'growthreaction and the cause of the positive 

 phototropism in). 774. 



Physics. J. D. VAN DER Waals : "On the point in which the solid state disappears 

 as an answer to the question in how far this point can be compared to the 

 critical point of a liquid. The easiest way to do this is by means of the curve". 39» 



— Ch. H. van Os : "On a system of curves occurring in Einstein's theory of 

 gravitation". 40. 



— J. J. VAN Laar : "Some diÜ'iculties and contradictions met with in the drawing 

 up of the equation of state". 44. 



— J. P. KuENEN and S. W. Visser : "Viscosimeter for volatile liquids". 75. 



— J. D. VAN DER Waals Jr. : "On the law of the partition of energy". III. 84. 

 IV. 401. V. 1082. 



— H. Kamerlingh Onnes : 'Further experiments with liquid helium". H. 113. 

 673, I. 987. 



— W. J. H. Moll: "A quick coil galvanometer". 149. 



— P. Zeeman : "The red lithium line and tlie spectroscopic determination of 

 atomic weights". 155. 



— H. R. Woltjer and P. Zeeman : "Magnetic resolution of spectrum lines and 

 temperature". 158. 



— H. Kamerlingh Onnes and Sopiius Weber: "Vapour pressures of substances 



of low critical temperature at low reduced temperatures. I. Vapour pressures of 



carbon dioxide between — 160° C. and — 183° 0." 215. 



81 

 Proceedings Royal Acad. Amsterdam. Vol. XVI. 



