Iv CONTENTS. 
Chemistry. E. H. Bécuner aud Miss. B. J. Karsren: “On the system: hydrogen 
bromide and bromine”. 504, 
— A. F. HoLLEMAN and J. J. Pouax: “On the bromation of toluol”. 511. 
— A. F. HorLEMAN and J. J. PorakK: “On the sulfonisation of benzol sulfonic 
acid”. 511, : 
— F. A. H. SCHREINEMAKERS: “The system: Copper sulphate, Copper chloride, 
Ammonium sulphate, Ammonium chloride and Water at 30°”. 615. 
— A.P. H. Trivetir: “A contribution to the photo-chemistry of silver (sub-) 
haloids”. 730. 
‘CHILOANGO in Portuguese West-Africa (Observation of the transit of Mercury on 
November 14, 1907 at). 108. 
CHLORO- and m bromobenzoic acid (The quantitative estimation of the products of 
nitration of m-). 260. 
CHLOROTOLUENE (The nitration of p-). 257. 
CHROMOGEN (Dipsacan and Dipsacotin, a new) and a new colouring-matter of Dipsa- 
ceae. 509. 
CIRRIPEDS (Some results of the investigation of the) collected during the cruise of the 
Dutch man-of-war “Siboga” in the Malay Archipelago. 110. 
CLAY (3.) and H. KAMERLINGH Onnes, On the measurement of very low tempera- 
tures. XXII. The thermo-element gold-silver at liquid hydrogen temperatures. 344. 
— On the change of the resistance of pure metals at very low temperatures and 
the influence exerted on it by small amounts of admixtures, II. 345. 
cLoupriness at Batavia (On frequencies of the mean daily). 366. 
COLOURING-MATTER of Dipsaceae (Dipsacan and Dipsacotin, a new chromogen and a 
new). 509. 
compiexrs (The types of bilinear »’-) of M_» in Sp. 625. 
components (The P-T-X-spacial figure for a system of two) which are miscible in 
the solid or liquid erystadline state in all proportions. 165. 
CONDENSATION (On the phenomena of) for mixtures of carbonic acid and urethane, 
in connection with double retrograde condensation. 913. 
COPPER SULPUATE, Copper chloride (The system:) Ammonium sulphate, Ammonium 
chloride and Water at 30°. 615. 
COWARD (Miss WINIFRED E.). On Ptilocodium repens a new gymncblastie hy- 
droid epizoic on a pennatulid. 635. 
CRYOGENIC LABORATORY (Methods and apparatus used in the). XV. An apparatus for 
the purifieation of gaseous hydrogen by means of liquid hydrogen. 883. 
CUBIC TRANSFORMATION (Congruences of twisted curves in connection with). 84. 
curvarures (Lhe relation between the intensity of light and the length of illumina- 
tion in the phototropic) in seedlings of Avena Sativa. 230, 
curves (On bieuspidal) of order four. 499. 
— (On) of order four with four fleenodal points or with two bifleenodal points. 568, 
— (On) which can be generated by projective involutions of rays. 576. 
cyroLocical. development (Contribution to the knowledge of the) of Oenothera La 
marekiana. 267. 
