bp CON TE N Ps} 
NITRATION (Bromination and) in the aromatic series. 643. 
NITRIC AcID (On the action of) on alkylated amides of p-toluenesulphonic acid. 616. 
NITROGEN-COMPOUNDS (The oxidation of organic) and the estimation of the carbon and 
nitrogen therein by the moist process. 91. 
NUMBERS (Factorisation of large). I. 326. II. 425. III. 501. 
NYLAND (A. A). Preliminary report of the Dutch expedition to Karang Sago 
(Sumatra). 593. 
ort (On some further constituents of the essential) of Kaempferia Galanga L. 618. 
OLIGONITROPHILOUS microbes (Further researches concerning). 5. 
ONNES (H. KAMERLINGH). See KAMERLINGH ONNEs (H.). 
oss (s. L. vAN). The elementary motion of space 5,. 218. 
OXIDATION (The) of organic nitrogen-compounds and the estimation of the carbon and 
nitrogen therein by the moist process. 91. 
OXYGEN (Isotherms of) at 20°0 C. 15°6 C. 0°90 C. 767. 
OYSTER cultivators (The unfavourable condition of which complain the) on the Eastern- 
Schelde. 379. 
PEKELHARING (C. A). Pepsin. 412. 
PENTANITROPHENOL (On pentanitrophenylmethylnitramine and tetra-and). 437. 
PENTANITROPHENYLMETHYLNITRAMINE and tetra- and pentanitrophenol. 437. 
PEPSIN. 412. 
PHOTOBACTERIA as a reactive in the investigation of the chlorophyll-function. 45. 
Physics. J. ©. ScHarLKwijk : Precise Isothermals. II. Accuracy of the measurement 
of pressure by means of the open manometer of KAMERLINGH Onnes. 23. IL. 
A waterjacket of constant ordinary temperature. 29. IV. The calibration of piézo- 
metertubes. 35. V. The isothermal of hydrogen at 20° C. up to 60 atmospheres.” 107. 
— Frep. Serum: Plane waves of light in an homogeneous, electrically and 
magnetically anisotropic dielectric.” I. 49. II, 148. 
— H. KAMERLINGH Onnes: „Expression of the equation of state of gases and 
liquids by means of series.” 125. 
— Pu. Kounstamm and B. M. van DarrsEN : /Vapourtensions of mixtures of 
ether and chloroform.” 156. 
— W. H. Junius: „On the origin of double lines in the spectrum of the chromo- 
sphere, due to anomalous dispersion of the light from the photosphere.” 193. 195. 
— P. Zeeman: #Some observations on the resolving power of the MICHELSON 
1 
echelon spectroscope”. 247. 
— W. HU. KeErsom: „Contributions to the knowledge of vaN DER Waars y-surface. 
V. The dependence of the plait-point constants on the composition in binary 
mixtures with small proportions of one of the components”. 293. VI. The in- 
crease of pressure at condensation of a substance with small admixtures”. 659. 
— Pu. A. Kounstamm: „The shape of an empiric isothermal of a binary mixture.” 
320. 
— L. H. Srterrspma: The dispersion of the magnetic rotation of the plane of 
polarisation in negatively rotating salt-solutions. II. Further measurements with 
potassium ferricyanide”, 339, 
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