xn 
points (On pairs of) which are associated with respect to a plane cubic. 711. 
— (On the structure of perfect sets of). 785. 
polar figures (On) with respect to a plane cubic curve. 776. 
polarization (The degree of completeness of the circular) of magnetically divided 
lines. 345. . 
postma (s.) and A. Suits. On the compounds of ammonia and water. 186. 
presentation tiue (Investigations on the relation between the) and intensity of 
stimulus in geotropic curvatures. 65. 
pressure (On the influence of the) on the miscibility of two liquids. 235. 
primates (On the position and displacement of the Foramen magnum in the). 362. 
— On the slope of the Foramen magnum in). 525. 
quadratures (On the surfaces the asymptotic lines of which can be determined by). 759. 
racemisu (On partial). 393. 
radioactivitt (On the) of Bubidium compounds. 154. 
refraction in the sun (Regular consequences of irregular) 266. 
reindeer (e.). Sap raising forces in living wood. 563 . 
respiration (The influence of temperature on the) of the higher plants. 219. 
rigidity (About the formation of creatine in the muscles at the tonus and the deve¬ 
lopment of). 550. 
rombdegh (p. van). Javanese Basilicum oil and Methylchavicol. 15. 
— The essential oil from the fruits of Morinda citrifolia L. 17. 
— presents a paper of Prof. Ernst Cohen and W. Tombrock. “The electromotive 
of zinc amalgams”. 9S. 
— presents a paper of Dr. C. J. Enklaar: “On the action of active copper on 
— On the nitration of diethylaniline. 297. 
— presents a paper of Dr. H. Dutilh: "On partial racemism”. 393. 
— presents a paper of Dr. H. R. Kruyt: “The equilibrium solid-liquid-gas in 
binary systems which present mixed crystals”. 537. 
— presents a paper of Prof. F. M. Jaeger: “Studies on Tellurium. L The mutual 
behaviour of the elements sulphur and tellurium”. 602. 
rotation (Remarks on the experiments of Wilson and Martyn on the velocity of) of 
the electric discharge in gases in a radial magnetic field. 428. 
rubidium compounds (On the radioactivity of). 154. 
scheffrr (p. e. c.). On heterogeneous equilibria of dissociating compounds. 257. 
schoute (p. h.) presents a paper of Dr. S. L. van Oss: “On pentaspherie geome¬ 
try”. 19. 
— presents a paper of Dr. W. van der Woude: “The cubic involution of the 
first rank in the plane”. 751. 
seed distribution (A brief contribution to the knowledge of endozoic) by birds in 
Java, based on a collection made by Mr. Barthels on the Pangerango and near 
Batavia. 108. 
serum-anaphylaxis (Contributions to the study of). 4 th Communication. 781, 
