X C OPN. THEN ALS 
JANSEN (J. D.). On the distinction between methylated nitro-anilines and their 
nitrosamines by means of refractometric determinations. If. 1098, 
JONG (Cc. DE). Determination of the constant of precession and of the systematic 
proper motions of the stars, by the comparison of Kiisrner’s catalogue of 10663 
stars with some zone-catalogues of the “Astronomische Gesellschaft””. 65. 
JULIUS (W. H.) presents a paper of Mr. BattH. vaN DER Por Jr.: “The currents 
arising in x-coupled circuits when the primary current is suddenly broken or 
completed”. 225. 
— presents a paper of Dr. W. J. H. Morr and Prof. L. S. Ornstein: “Contribu- 
tions to the research of liquid crystals”. 1315. 
KAHN (JUL) en F. M. Jarcer. Investigations on the temperature-coefficient of 
the free molecular surface-energy, of liquids between -- 80° and 1650° C. XV. 
381. XVI. 397. 
KAMERLINGH ONNES (H.). v. ONNEs (H. KAMERLINGH). 
KAPTEYN (J. C.) presents a paper of Prof. M.J. van Uven: “Logarithmic frequency 
distribution”. 533. 
— presents a paper of Prof. M, J. van Uven: “Skew frequency curves’. 670. 
KIDNEYS (Experimental researches on the permeability of the) to glucose. [. 989. II. 997. 
KINETIC THEORY (On the) of solids, I. 1289. IL. 1295. IIL. 1304. 
KLUYVER (J. C.). On some numerical series considered by Eurer. 275. 
— presents a paper of Mr. J. G. vaN DER Coreur: ‘On the values which the 
function & (s) assumes for s positive and odd. 489. 
— The primitive divisor of wm—1, 785. 
— presents a paper of Mr. J. G. van per Corpur: “On an arithmetical function 
connected with the decomposition of the positive integers into prime factors” 
I. 826. IL, 842. 
KNOOPS (H. R.). v. ZWAARDEMAKER (H.). 
KOSTER (J, J. a.) and H. M. pe Burver. On the determination of the position of 
the macula-planes and the planes of the semicircular canals in the cranium. 49. 
KRUYT (H. R.), The equilibrium solid-liquid-gas in binary systems which present 
mixed crystals. 4th Comm. 555. 
— Current potentials~of electrolyte solutions. 2nd Communication. 1021. 
KRUYT (H. R.) -and W. D. Hetperman. The equilibrium solid-liquid-gas in binary 
systems which present mixed crystals. 3rd Comm. 439. 
KUENEN (3. P.) presents a paper of Dr. S. W. Visser: “On the diffraction of the 
light in the formation of halos”, 1174. 
KUENEN (J. P.) and A. L. Crark. Critical point, critical phenomena and a few 
condensation-constants of air. 1088. 
KUTEI (Borneo) (Modifications of the facies in the tertiary formation of Hast). 728. 
LAAR (J. J. VAN). On the fundamental values of the quantities 6 and p/a for 
different elements, in connection with the periodic system. II. 2. HIL. 287. IV. 295. 
Laws of the BROWNIAN movement in a gas (Experimental inquiry into the). 1006. 
LEPIDIUM SATIVUM (The influence of temperature on the growth of the roots of). 61. 
