CONTENTS. IX 



jaeger (f. m.). On a substance which possesses numerous diilerent liquid phases 

 of which three at least are stable in regard to the isotropous liquid. 359. 



— On substances which possess more than one stable liquid state, and on the 

 phenomena observed in anisotropous liquids. 472. 



— On irreversible phase-transitions in substances which may exhibit more than 

 one liquid condition. 483. 



— On the anisotropous liquid phases of the butyric ester of dihydrocholesterol, 

 and on the question as to the necessary presence of an ethylene double bond for 

 the occurrence of these phenomena. 701. 



— On the influence which irradiation exerts on the electrical conductivity of 

 Antimonite from Japan. 809. 



jena glass (Coefficient of expansion of) and of platinum between + 16° and — 182°. 199. 



jolles (Miss t. c.) and H. Kamerlingh Onnes. Contributions to the knowledge 

 of the Jz-surface of van der Waals. XIV. Graphical deduction of the results of 

 Kuenen's experiments on mixtures of ethane and nitrous oxide. 664. 



JULIUS (w. H.). Arbitrary distribution of light in dispersion bands, and its bearing 

 on spectroscopy and astrophysics. 343. 



— presents a paper of W. J. H. Moll: "An in v«stigation of some ultra-red metallic 

 spectra." 544. 



— Wave-lengths of formerly observed emission and absorption bands in the infra- 

 red spectrum. 706. 



jdpiter (Mutual occultations and eclipses of the satellites of) in 1908. 304. 2nd part. 444. 



kamerlingh onnes (h.). Methods and apparatus used in the Cryogenic Labora- 

 tory at Leiden. X. How to obtain baths of constant and uniform temperature by 

 means of liquid hydrogen. 156. XI. The purification of hydrogen for the 

 cycle. 171. XII. Cryostat especially for temperatures from — 252° to — 259°. 

 173. XIII. The preparation of liquid air by means of the cascade process. 177. 

 XIV. Preparation of pure hydrogen through distillation of less pure hydrogen. 179. 



— Contributions to the knowledge of the vj/-surface of van der Waals. XI. A 

 gas that sinks in a liquid. 459. 



kamerlingh onnes (h.) and C. Braak. On the measurement of very low- 

 temperatures. XIII. Determinations with the hydrogen thermometer. 367. XIV. 

 Keduction of the readings of the hydrogen thermometer of constant volume to 

 the absolute scale. 775. 



— Isotherms of diatomic gases and their binary mixtures. VI. Isotherms of hydro- 

 gen between — 104° C and — 217°. C. 754. 



kamerlingh onnes (h.) and J. Clay. On the measurement of very low 

 temperatures. X. Coefficient of expansion of Jena glass and of platinum between 

 + 16° and — 182°. 199. XI. A comparison of the platinum resistance thermometer 

 with the hydrogen thermometer. 207. XII. Comparison of the platinum resistance 

 thermometer with the gold resistance thermometer. 213. 



kamerlingh onnes (h.) and C. A. Crommelin. On the measurement of very 

 low temperatures. IX. Comparison of a thermo-element constantin-steel with the 

 hydrogen thermometer. ISO. Supplement. 403. 



