XVIII © ONT BN Ese 
POLYTOPE (On the relation between the vertices of a definite sixdimensional) and the 
lines of a cubic surface. 375. 
poLyTopes and nets (Reciprocity in connexion with semiregular). 354. 
POTASSIUM ISOCYANATE (On the reaction products of) and diaminoacetone hydrochloride. 
Amino- and ureopropylene-uréine. 625. 
PRESENTATION-TIME (The influence of temperature on the) in geotropism. 476. 
PRESSURE (The critical phenomena of dissolution of mixtures with normal components 
examined under variable). 507. 
— of a gas (Determination of the) by means of GrgBs’ statistical mechanics. 135. 
PRIMATES (On the development of the hypophysis of) especially of Tarsius. 660. 
PRINS (4DA). Critical phenomena of the ternary system: ether- anthraquinone- 
naphthalene. 353. 
PRINS (m. J.) and J. BoËsrkenN. The synthesis of as. heptachloropropane from tetra- 
chloro- ethylene and chloroform with the co-operation of aluminiumchloride. 685. 
PULSE WAVE (Diffraction of a single) through a slit according to KrrcuuorF’s theory. 394. 
— (On the final integral occurring in Prof. Wixp’s paper: “Diffraction of a single) 
through a slit according to KircuHorr’s theory. 405. 
PULVINAR THAL\MI OPTICI (A tumour in the). 928. 
QUARTIC CURVES (On) of deficiency zero with a rhampoid cusp and a node. 652. 
QUASI-ASSOCIATION or molecule-complexes. 107. II. 494. 
RADIUM CONTENT (Investigations on the) of rocks. I. 359. II. 818. 
REFLEX REACTIONS (Unisegmental). 715. 
REID (CLEMENT) and Mrs. Erranor M. Rem. A further investigation on the 
pliocene flora of Tegelen. 192. 
REILINGH (D. DE VRIES) v. Vries REILINGH (D. DE) 
RETICULAR CELLS (Remarks on the) of the oblongata in different vertebrates. 1047. 
RICEBACTERIA (Acetifying air- and) the cause of Polyneuritis gallinarum. 904. 
RING OPENING (The velocity of the) in connection with the composition of the 
unsuturated ring systems. 534. 
RINKES (1. 3.) and A. F, HoLvEMaN. On the introduction of halogen atoms into 
the core of phenols. 42". 
rocks (Investigations on the radium content of). I. 359. II. 818. 
ROMBURGH (P. VAN) presents a paper of Dr. H. R. Kruyr: “The equilibrium 
solid-liquid-gas in binary systems which present mixed crystals”. 2nd Commu- 
nication. 206. 
— On the action of nitrous acid on dinitrodialkyl-anilines. 820. 
— Hypaphorine and the relation of this substance with tryptophane. 1177. 
RUTGERS (A. A. L.). The influence of temperature on the presentation time in 
geotropism. 476. 
RUTTEN (1). On Orbitoides in the neighbourhood of the Balik Papan Bay. East- 
coast of Borneo. 1122. 
RIJNBERK (G. A. VAN). Unisegmental reflex-reactions. 715. 
— and C. Winkrer. Experimental researches on the segmental innervation of the 
skin in dogs, 6th Communication. 270. 7th Communication. 431. 
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