CONTENTS XIX 
Physics. P. PrreNrest: “On interference phenomena to be expected when Röntgen 
rays pass through a di-atomic gas”, 1184. 
— F. M. JarGer: “On a new phenomenon accompanying the diffraction of 
Röntgen rays in birefringent crystals”. 1204, 
— P, Enrenrest: “On the kinetic interpretation of the osmotic pressure”. 1241, 
Physiology. B, Laqueur: “On the survival of isolated mammalian organs with auto- 
matic function”. 270, 
— L. K. Wotrr: “On the formation of antibodies after injection of sentizised 
antigens”. II. 318. 
— G. van RijNBERK: “On the nerve-distribution in the trunk-dermatoma”. 632, 
— A. A. HYMANs VAN DEN BERGH and J. J. DE LA Fonrarne ScaLuIrEr: “The 
identification of traces of bilirubin in albuminous fluids”. 807. 
— I. K. A. WERTHEIM SALOMONSON: “Exaggeration of deep reflexes”. 885. 
— 8S. DE Boer: “On the heart-rhythm”. 1075. IL. 1135, 
— A. B, DrooarLEBVER Fortuyn: “The decoloration of fuchsin-solutions by amor- 
phous carbon”. 1322. 
— H. J. HAMBURGER: “Phagocytes and respiratory centre”. 1825, 
PICRYLMETHYLAMIDE (The coloration of some derivatives of) with alkalies. 647. 
PLANCK (Simplified deduction of the formula from the theory of combinations which) 
uses as the basis for his radiation theory. 870. 
PLANET Jupiter (The figure of the). 1047. 
PLANETS (On SEELIGER’s hypothesis about the anomalies in the motion of the 
inner). 23. 
PLANTS (On the mutual influence of the phototropic and geotropic reactions in). 1278 
POLYNOMIA (On HeErmite’s and ABEL’s). 192. 
POSTMA (s.) and A. Smits. The system Ammonia-water. 182. 
POTASSIUM (The allotropy of). 1. 1115. 
POTASSIUM SULPHATE, potassium chlorid (The system: copper sulphate, copper chlorid) 
and water at 30°. 538. 
POTENTIAL (On the thermodynamic) as a kinetic quantity. lst part. 85. 
POTENTIALS (Current) of electrolyte solutions. 615. 
PRECISION (The theory of the combination of observations and the determination of 
the), illustrated by means of vectors. 490. 
PRINS (Miss aDA). On critical end-points and the system ethane-naphtalene. 1095. 
PSEUDO-COMPONENTS (The metastable continuation of the mixed crystal series of) in 
connection with the phenomenon allotropy. IL. 672. 
quantity 4 (On apparent thermodynamic discontinuities in connection with the value 
of the) for infinitely large volume. 606. 
QUANTUM-THEORY (The chemical constant and the application of the) by the method 
of the natural vibrations to the equation of state of an ideal monatomic gas). 20, 
QUATERNARY SYSTEM KCl—CuClg—BaClo-—H,20 (On the). 781. 
auintics (A bilinear congruence of rational twisted). 1250. 
RADIATION THEORY (Simplified deduction of the formula from the theory of combina- 
tions which PLANCK uses as the basis for his), 870. 
