& OENE DEN NE DES, vu 
FuNcTIONS (Equations in which) occur for different values of the independent variable. 534. 
— C (x) (New theorems on the roots of the). 196. 
Gas (The cooling of a current of) by sudden change of pressure. 379. 
Gases (Mercury pump for compressing pure and costly) under high pressure. 406. 437. 
GASMANOMETERS (Standard). 29. 
GEGENBAUER (n.). New theorems on the roots of the functions ús (2). 196. 
GENUS UNITY (On twisted quinties of). 374. 
GOLD and mercury (On isomorphous compounds of). 163. 
GRAPHIC SYSTEM (A new) of Craniology. 327. 
GRAVITATION (Considerations on). 559. 
GRESHOFFE (M.). Echinopsine, a new crystalline vegetable base. 645. 
HALF- TIDE (On the relation between the mean sea-level and the height of). 189. 
HALL-EFFECT (The) and the increase of resistance of bismuth in the magnetic field at 
very low temperatures. 228. 229. 348. 
HAMBURGER (i. J.). The resorption of fat and soap in the large and the small 
intestine. 234, 287. 
— Lipelytie ferment in ascites-liquid of man. 406. 428, 
— On the power of resistance of the red bloodeorpuseles. 574. 
HAZENORHRL (FRITZ). The dielectric coefficients of liquid nitrous oxide and 
oxygen. 140. 211. 
HAZEWINKEL (J, J.). Indican-its hydrolysis and the enzyme causing the same. 512, 
HISSINK (H. J.). On mixed crystals of Sodium nitrate with Potassium nitrate and 
of Sodium nitrate with Silver nitrate. 158, 
HOLLEMAN (A. F.). On the nitration of benzoic acid and its methylic and ethylic 
salts. 4. 
— The formation of trisubstituted derivatives from disubstituted derivatives of Bens 
zene. 468. 478. 
HoLMEs (On the finding back of the comet of) according to the computations of 
H. J. Zwiers. 69. 
NOOGEWERFF (s.) presents a paper of J. J. HazewinkeL: /Indican-its hydtolysis and 
the enzyme causing the same.” 512. 
— and H. rer Mev en. Contribution to the knowledge of Indican. 520, 
HUBRECHT (A. A. W.) presents a paper of Dr. J. F. van BEMMELEN: The results 
of a comparative investigation concerning the palatine-, orbital- and temporal 
regions of the Monotreme-skull.” 81. 
HULSHOF (H.). The direct deduction of the capillary constant ¢ as a surface tension. 389. 
HYDROGEN-NITRATE (The action of) upon the three isomeric chloro-benzoie acids and 
some of their derivatives. 407. 461. 
Hydrography. J. P. vaN per Stok: /Tidal constants in the Lampong- and Sabang bay; 
Sumatra.” 178. 
— H. E. pr Bruyn: „On the relation between the mean sea-level and tlie height 
of halftide.” 189. 
HYPERSPHERICAL CURVATURE (On the locus of the centre of) for the normal curve of 
n-dimensional space. 527. 
