CONTENTS. V 



common points (The locus of the pairs of) ofw-j-1 pencils of (« — 1) dimensional 

 varieties in a space of n dimensions. 573. 



complexes of revolution (Quadratic). 217. 



compounds (Contribution to the knowledge of the action of absolute nitric acid on 

 heterocyclic). 600. 



concentration (On the course of the P, T-curves for constant) for the equilibrium 

 solid-fluid. 9. 



conductivity powrr (Researches on the thermic and electric) of crystallised conduc- 

 tors. I. 89. 



conductobs (Researches on the thermic and electric conductivity power of crystal- 

 lised). 1. 89. 



crommelin (c. a.) and H. Kamerltngii Onnes. On the measurement of very low 

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

 hydrogen-thermometer. 180. Supplement. 403. 



cryogenic laboratory at Leiden (Methods and apparatus used in the). 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 throuo-h 

 distillation of less pure hydrogen. 179. 



cryostat especially for temperatures from — 252° to — 259°. 173. 



crystal-forms (On the) of the 2,4 Dinitroaniline-derivatives, substituted in the 

 Nil, -group. 23. 



— (On a new case of form-analogy and miscibility of position-isomeric benzene- 

 derivatives, and on the) of the six Nitrodibromobenzenes. 26. 



Crystallography. F. M. Jaeger: "On a new case of form-analogy and miscibility of 

 position-isomeric benzene-derivatives, and on the crystal-forms of the six Nitrodi- 

 bromobenzenes." 26. 



— F. M. Jaeger: "On the fatty esters of Cholesterol and Phytosterol, and on the 

 anisotropous liquid phases of the Cholesterol-derivatives." 78. 



cubics (The locus of the cusps of a threefold infinite linear system of plane) with 



six basepoints. 53 k 

 current (Velocities of the) in an open Panama-canal. 849. 



current-measurements at various depths in the North-Sea. 1st Communication. 566. 

 curves (On the course of the P , T-) for constant concentration for the equilibrium 



solid-fluid. 9. 



— of three pencils (On the locus of the pairs of common points and the envelope 

 of the common chords of the). 1st part. 424. 2nd part. Application to pencils 

 of conies. 548. 



cusps (The locus of the) of a threefold infinite linear system of plane cubics with 



six basepoints. 534. 

 cycle (The purification of hydrogen for the). 171. 

 cyclic point of a twisted curve (Second communication on the Plucker equivalents 



of a). 364. 



