CONTENTS. 



Geology. Eug. Dubois : "Facts leading to trace out tlie motion and the origin of tlie 

 underground water in our sea-proviuces." 738. 



G I Ü B s (The representation of the continuity of the liquid and gaseous conditions on 

 the one hand and the various solid aggregations on the other by tlie entropy- 

 volume-energy surface of). 678. 



GLACIAL PEKIOD (Deep boulder-clay beds of a latter) in North- Holland. 340. 



GLUCOSE (The mutual transformation of the two stereoisomeric pentacetates of ^/-). 779- 



GLUCOSIDES (The mutual transformation of the two stereoisomeric methyl-r/-). 99. 



GORTER (a.). The cause of sleep. 86. 



GRAVITATION (Influence of) on the phenomena in the neighbourhood of the plaitpoint 

 for binary mixtures. 593. 



GRIEND JR. (j. VAN D e). llectifyiug curves. 208. 



GRIJNS (g.). The Ascus-form of Aspergillus fumigatus Fresenius. 312. 



ij A G A (h.). Extract from the Report made by the committee for awarding the l^UYS- 

 Ballot medal. 78. 



— presents a paper of G. van Dijk and J. Kunst : "A determination of the electro- 

 chemical equivalent of silver." 441. 



HAMBURGER (h. J.) presents a paper of E, Hekma : "On the liberation of trypsin 

 from trypsin-zymogen." 34. 



H A p P E L (h.) and H. Kamerlingh Onnes. The representation of the continuity of 

 the liquid and gaseous conditions on the one hand and the various solid aggre- 

 gations on the other by the entropy-volume- energy surface of GiBBS. 678. 



H A R R E V E L D (p H. V A n). On the penetration into mercury of the roots of freely 

 floating germinating seeds. 182. 



HEKMA (e.). On the liberation of trypsin from trypsin-zymogen. 34. 



HERZOG (R. o.). On the action of Emulsin. 332. 



HOLLEMAN (A. P.). Preparation of Cycloliexanol. 201. 



— The nitration of Benzene fluoride. 659. 



— Action of hydrogen peroxyde on diketones 1,2 and on «-ketonic acids. 715. 



— and J. W. Beekman. Benzene fluoride and some of its derivations. 327. 

 and J. Potter van Loon. The transformation of benzidine. 262. 



— and G. L. Voerman. A quantitative research concerning Baeyer's tension 

 theory. 410. 



HOMOGENOUS SYSTEM (Enzymactious considered as equilibria in a). 605. 

 HOOGEWERFF (s.) presents a paper of Jan Rutten : "Description of an apparatus 

 for regulating the pressure when distilling under reduced pressure." 665. 



— and W. A. van Dorp. On the compounds of unsaturated ketones with acids. 325. 

 H u B R E c H T (a. A. W.J presents a paper of Prof. Hans Strahl : "The process of 



involution of the mucous membrane of the uterus of Tarsius spectrum after 

 parturition." 802. 



— On the relationship of various invertebrate phyla. 839. 



hydrates of nickelsulphate (The condition of) in methylalcoholic solution. 91. 



— (The conductive power of) dissolved in methylalcohol. 94. 

 HYDRAZINE (The actiou of phosphorus on). 1. 



