vi CoNtEN TS, 
HOEK (p. P. C.). The unfavourable condition of which complain the oyster cultivators 
on the Eastern-Schelde. 379. 
HOOGEWERFF (s.) and W. A. van Dorp. On the influence of the position of 
atomgroups in aromatic compounds on the process of the reactions, 161. 
HUBRECHT (A. A. W.). On the gastrulation and the formation of the mesoblast in 
mammals. 161. 
HYDRAZINE and water (The densities of mixtures of). 756. 
HYDROGEN (The compressibility of) at 0°.0C and 20°.0C determined by the piezometers 
with variable volume for low temperatures. 776. 
— (The isothermal of) at 20° C. up to 60 atmospheres. 107. 
HYDROSIMETER (On the). 243. 
z-HYDROXYBUTENOIC ACID (On) (Vinylglycollic acid) and its decompositions. 79. 
HYNDMAN (H. H. FRANCIS) and H. KAMERLINGH ONNrs. Isotherms of diatomic 
gases and their binary mixtures. IL, The determination of density with the 
piezometer of variable volume for low temperatures. 761. ILL. The isotherms of 
oxygen at 20°.0 C. 15°.6 C. 0°0 C. 767. LV. The compressibility of hydrogen 
at 0°.0 C. and 20°.0 C. determined by the piezometers with variable volume for 
low temperatures. 776. 
INDUCTION cor (The effect of the) in telephonic apparatus. I. 358, II. 400. 
\ INFUNDIBULAR REGION (On the) of the brain of Amphioxus lanceolatus. 695. 
INFUNDIBULUM in Muraenoids (On the development of the entoderm, of Kuprrrr’s 
vesicle, of the mesoderm of the head and of the). 442. 
INOTROPIC INFLUENCE (The negative-) of the nervus vagus on the heart. 162. 
INTFGRAL (A definite) containing Brsser’s functions. 102. 
INTEGRALS (On) containing functions of Bessri. 584. 
INTESTINAL CANAL (The physiological bacteriology of the). 477. 
INTESTINAL JUICE (On the) of man. 733. 
IONISATION (On the repelling of the) of solutions of NaOH, Na,CO, and NaHCO, by 
addition of NaCl. 42. 
ISOTHERMAL (The shape of an empiric) of a binary mixture. 320. 
— of hydrogen (The) at 20° C. up to 60 atmospheres. 107. 
ISOTHERMALS (Precise). IL. Accuracy of the measurement of pressure by means of the 
open manometer of NAMERLINGH OnNes. 23. [IL A waterjacket of constant 
ordinary temperature 29. IV. The calibration of piezomertubes. 35. V. The 
isothermal of hydrogen at 20° C. up to 60 atmospheres. 107. 
ISOTHERMS of diatomic gases and their binary mixtures. II. 761. III. 767. IV. 776. 
— of oxygen at 20°0 C. 15% C. 0°0 C. 767. 
JULIUS (v. A.) presents a paper of Dr. A. Smits: „Investigations with the Microma- 
nometer.” 163. 
JULIUS (W. 1). On the origin of double lines in the spectrum of the chromosphere, 
due to anomalous dispersion of the light from the photosphere. 193. 195. 
— Preliminary Report of the Dutch expedition to Karang Sago (Sumatra), 593. 
KAEMPFERIA GALANGA L. (On some further constituents of the essential oil of). 618, 
