CONTENTS VII 
CROMMELIN (C. a.) and H. KaMerLINGH ONNes. Isothermals of monatomic gases 
and of their binary mixtures. XVUI. 515. 
— and Miss E. I. SMrp. Comparison of a pressure balance of Schäffer and 
Budenberg with the open standard-gauge of the Leiden Physical Laboratory 
between 20 and 100 atmospheres, as a contribution to the theory of the pressure 
balance. 472. 
CRYOGENIC LABORATORY (Methods and apparatus used in the). XVI. 507. 
CRYSTALLINE FORM (Some remarks on the capillarity theory of the). 173. 
Crystallography. H. Haca and ¥. M, JarGEr: “On the symmetry of the Röntgen- 
patterns of trigonal and hexagonal crystals, and on normal and abnormal diftraction- 
images of birefringent crystals in general.” 542. 
— H. Haca and F. M. Jarcer: “On the symmetry of the Röntgen-patterns of 
rhombic crystals”. 559. 
CRYSTALS (The symmetry of the Röntgen-patterns of monoclinic). 1201. 
— (The symmetry of the Röntgen-patterns of tetragonal). 1350. 
— (On Röntgen patterns of isomorphous). 1357. 
— (On the symmetry of the Röntgen-patterns of triclinic and some rhombic), and 
some remarks on the diffraction-images of quartz. 1552, 
CUBIC SURFACES (Bilinear congruences of twisted curves, which are determined by 
nets of). 431. 
cusics (Tangential curves of a pencil of rational). 1277. 
cycuops (On the brains of) and monstra related to them. 1399. 
DENDROBIUM CRUMENATUM LINDL (On the influence of external conditions on the 
flowering of). 526. 
DENTITION (On the relation between the) of Marsupials and that of Reptiles and 
Monodelphians. 715. 
DESMAs or desmoids (On the occurrence of) in Hymeniacidon sanguinea. 1159, 
DEVENDRA NATH BHATTACHARYYA and NILRATAN Duar. Supersaturation 
and release of supersaturation. +69. 
— Temperature-coeflicient of conductivity in ‘alcoholic solutions, and extension 
of Koutravuscn’s hypothesis to alcoholic solutions. 373. 
— Velocity of ions at O° C. 375. 
DIFFRACTION-IMaGES (On the symmetry of the Röntgen-patterns of trigonal and 
hexagonal crystals, and on normal and abnormal) of birefringent crystals 
in general. 542. 
-- of quartz (On the symmetry of the Réntgenpatterns of triclinic and some rhombic 
crystals, aud some remarks on the). 1552. 
DISPERSION (Anomalous) and FRAUNHOFER lines. Reply to objections. 1691. 
DISPERSION THEORY (On the) of solar phenomena, derived from measurements by 
Apams and Sr. Joan on the displacements of FRAUNHOFER lines in the spectra of 
the sun’s limb and of sun-spots. 1691. 
pIssYMMETRY (Investigations on PasTeuR’s principle of the relation between molecular and 
physical). II. 49. 
