XXII ClO NAT SE EN LAS: 
PSYCHOGALVANIC REACTION (On the value of the simultaneous registration of the 
plethysmogram and the) 1154. 
PSYCHOGALVANIC REFLEX (Resistance, polarisation and the). 1266. 
pyruvic acIp (Formation of) from malic acid by microbes 1198. 
QUADRICS (Associated points with respect to a complex of). 441. 
QUADRUPLET (The second virial-coefficient for rigid spherical molecules, whose mutual 
attraction is equivalent to that of a) placed at their centre. 636. 
QUADRUPLETS (On the second virialcoefficient for rigid spherical molecules carrying). 
1568. 
quarTz (On the symmetry of the Réntgen-patterns of triclinic and some rhombic 
crystals, and some remarks on the diffraetion-images of) 1552. 
RECOGNITION (On inhibition proceeding from a false). 1412. 
REINDERS (w.) and F. Gouprraan. Equilibria in the system Cu-S-O ; the roasting 
reaction process in copper. 150 
RELATIVITY (Confirmation of the principle of). 591. 
REPTILES (On the relation ‘between the dentition of Marsupials and that of) and 
Monodelphians. 715. 
RESISTANCE, POLARISATION aud the psycho-galvanic reflex. 1266. 
RESISTANCE-TUERMOMETRY (An interpolation-formula for) at low temperatures. 914. 
REVERSIBLE CHANGE (On the) of the remanent magnetisation with the temperature. 1068. 
RHOMBIC CRYSTALS (On the symmetry of the Rontgen-patterns of). 559. 
RINGER (w. £.). Further researches on pure pepsin. 738. 
ROASTING reaction process (The) with copper. 150. 
ROELOFS (c. of T0). On the function of the m. obliquus superior of the eye. 1364. 
ROELS (¥.). On after-sounds. Sil. 
— On inhibition proceeding from a false recognition, 1412. 
ROMBURGH (G. VAN). Nitro-derivatives of alkylbenzidines. 757. 
ROMBURGH (P. VAN) presents a paper of Prof. I. M. Jagcer and Dr. Jun. 
Kaun: “Investigations on the temperature-coefticients of the free molecular surface - 
energy of liquids at temperatures from —80° to 1650° CG.” IX. 75. 
— Action of methylethylketone on 2.3.4.6 tetranitrophenylmethylnitramine. 98. 
— presents a paper of Mr. G. van Rompurcu: “Nitro-derivatives of alkylben- 
zidines”. 757. 
— presents a paper of Dr. H. R. Kruvr: “Double refractive sol of vanadium 
pentoxide”. 1625. 
RONTGEN-PATTERNS (On the symmetry of the) of trigonal and hexagonal crystals, 
and on normal and abnormal diffraction-images of birefringent crystals in 
general. 542, 
— (On the symmetry of the) of rhombic erystals. 559 
— (The symmetry of the) of monoclinic erystals. 1201. 
— (The symmetry of the) of tetragonal crystals. 1350. 
— (On) of isomorphous erystals 1357. 
— (On the symmetry of the) of triclinic and some rhombic crystals, and some 
remarks on the diffraction-imayes of quartz. 1552. 
