CONTENTS, XV 



Physics. H. Kamekltngh Onnes and C. Braak: "Isotherms of diatomic gases and their 

 binary mixtures. V[. Isotherms of hydrogen between — 104° C. and — 217° C." 754. 



— H. Kamerlingh Onnes and C. Bkaak: "On the measurement of very low 

 temperatures. JCIV. Reduction of the readings of the hydrogen thermometer of 

 constant volume to the absolute scale." 775. 



— H. Kamerlingh On nes and W. H. Kkesom-. "Contributions to the knowledge 

 of the ^-surface of van der Waals. XV. The case that one component is a gas 

 without cohesion with molecules that have extension. Limited miscibility of two 

 gases." 786. 



— F. M. Jaeger : "On the influence which irradiation exerts on the electrical 

 conductivity of Antimonite from Japan." 809. 



Physiology. H. J. Hamburger and Svante Arrhenids: "On the nature of precipitin- 

 reaction." 33. 



— J. K. A. Wertheim Salomonson: "A few remarks concerning the method of 

 the true and false cases." 222. 



— H. Zwaardemaker: "An investigation on the quantitative relation between 

 vagus stimulation and cardiac action, an account of an experimental investigation 

 of Mr. P. YYolterson." 590. 



phytosterol (On the fatty esters of Cholesterol and), and on the anisotropous liquid 



phases of the Cholesterol-derivatives. 78. 

 placenta (On the formation of red blood-corpuscles in the) of the flying maki 



(Galeopithecas). 873. 

 placentation (On the) of Sciurus vulgaris. 380. 

 plaitpoint curves (The shape of the spinodal and) for binary mixtures of normal 



substances. 4th Communication. The longitudinal plait. 220. 

 plants (On the harmful consequences of the secretion of sugar with some myrmeco- 



philous). 150. 

 pl\tinum (Coefficient of expansion of Jena glass and of) between -\- 10° and — 182°. 1 99. 

 PLUCKER equivalents (Second communication on the) of a cyclic point of a 



twisted curve. 364. 

 polarisation (On the) of Böntgen rays. 104. 



post ma (o.). Some additional remarks on the quantity // and Maxwell's distribu- 

 tion of velocities. 492. 

 potassium hypochlorite (Action of) on cinnaiuide. 303. 

 precipitin-reaction (On the nature of). 33. 

 quantity H (Some additional remarks on the) and Maxweli/s distribution of 



velocities. 492. 

 ringer (w. e.). v. wind (c. h.). 

 rom burg h (p. van) presents a paper of Dr. F. M. Jaeger : "On the crystal-forms 



of the 2.4 Dinitroaniline-derivatives, substituted in the iVüTj-group". 23. 



— Triformin (Glyceryl triformate). 109. 



— presents a paper of Dr. N. H. Cohen : a "On Lupeol". 4f3fi. b "On aand /3 

 amyrin from bresk". 471. 



— and W. van Porssen. On some derivatives of 1-3-5-hexatriene. 111. 



