COEN TE NDS XV 
NucLEus (On the structure of the) and karyokinesis in Closterium Ehrenbergii Men. 365 
— facialis dorsalis, nucleus trigemini posterior, nucleus trochlearis posterior. 143. 
OBLONGATA (Remarks on the reticular cells of the) in different vertebrates. 1047. 
OENOTHERA NANELLA (On the cause of dimorphism in). 680. 
ORBITOIDES (On) in the neighbourhood of the Balik Papan bay (East coast of Borneo). 
1122. 
ORIENTATION (On the) of microscopic crystal-sections. 720. 
— of erystal-sections, 1031. 
ORNSTEIN (L. S.). Determination of the pressure of a gas by means of G1BBS’ 
statistical mechanics. 135. 
— Some remarks on the mechanical foundation of thermodynamics. I. 804. IL. 858. 
— and Pu. Kounstamm. On Nernst’ theorem of heat. 700. 
OSCILLATIONS (The) about a position of equilibrium where a simple linear relation 
exists between the frequencies of the vibrations. 742. 
OSMOTIC TEMPERATURES (On) and the kinetic signification of the thermodynamic 
potential 798. 
OXIDATION (Pigments as products of) by bacterial action. 1066. 
OXYGEN (On the consumption of) by the nervous system. 577, 
— (Reetilinear diameter for). 939. 
Palaeontology. CLEMENT Rerp and Mrs, EreaNor M. Rem: “A further investigation 
of the pliocene flora of Tegelen”. 192. 
PANNEKOEK (A). Researches into the structure of the gallaxy. 239. 
PARENTAL CARE (A new case of) among fishes. 583. 
PEKELHARING (C. A.) presents a paper of Mr. J. B. Karz: “Experimental researches 
on the analogy between swelling (imbibition) and mixing”. 958. 975. 
PERMEABILITY (The) of red blood-corpuscles in physiological conditions, especially to 
alkali- and earthalkali metals. 258. 489. 927. 
PuaGocyres (The influence of small amounts of calcium on the motion of). 56. 
PHAGOCY10sIS (On the influence of iodoform, chloroform and other substances dissoluble 
in fats, on). 982. 
PHENOLS (On the introduction of halogen atoms into the core of). 429. 
PHOTOTROPIC CURVATURES (On the connection between stimulus and effect in) of 
seedlings of Avena sativa, 1022. 
Physics. W. H. Junius: ‘‘Note on the interpretation of spectroheliograph results and 
of line shifts and on anomalous scattering of light”. 2. 
— P. Zeeman and B. Winawer: “The magnetic separation of absorption lines in 
connection with sun-spot spectra”. 2nd part. 35. 3rd part. 162. 
— C. A. CROMMELIN: “Isotherms of monatomic gases and of their binary mixtures, 
IV. Remarks on the preparation of argon. V. Vapour pressures above — 140° C., 
critical temperature and critical pressure of argon’’. 54. 
— H. A. Lorentz: “On the scattering of light by molecules’. 92. 
—- J. D. van DER Waars: “Quasi-association or molecule-complexes”. 107. LI. 494. 
— L. 8. ORNSTEIN: “Determination of the pressure of a gas by means of GrBBs’ 
statistical mechavics’’, 135, 
