CONTIN TS vit 
HOOGEWERFF (s.) presents a paper of Mr. A. P. H. Triventi: “A contribution 
to our knowledge of the solarization phenomenon and of some other properties 
of the latent image.” 2. 
— presents a paper of Dr. P. Trscu: “On the behaviour of fossil shells in water 
containing carbonic acid.” 236, 
HOOGEWERFE (S.) presents a paper of Dr. N. L, Séuncun: “The splitting up of 
ureum in the absence of elbumen.” 513. 
— presents a paper of Mr. A. P. H. Trrverur: “A contribution to the photo- 
chemistry of silver- (sub ) haloids.” 730. 
HYDROGEN (Calculation for). 863. 
— (An apparatus for the purification of gaseous) by means of liquid hydrogen. 883. 
HYDROGEN BROMIDE and bromine (On the system). 504. 
HYDROGEN TEMPERATURES (The thermo-element gold-silver at liquid). 344, 
HYDROID (On Ptilocodium repens a new gymnoblastic) epizoic on a pennatulid. 635. 
ICACINACEAE (Polyporandra Junghuhnii, a hitherto undescribed species of the order of), 
found in ’s hijks Herbarium at Leiden. 763. 
Ice (On the motion of a metal wire through a piece of). Il. 886. 
INTEGRAL-THEOREM (An) of GEGENBAUER. 749. 
INTENSITY OF LIGHT (On the relation between the) and the length of illumination in 
the phototropic curvatures in seedlings of Avena Sativa. 250. 
INVOLUTIONS by rays (On curves which can be generated by projective). 576. 
IsON (The Zerman-eflect of the strong lines of the violet spark spectrum of) in the 
region A 2380 — A 4416. 222. 
ISOBARS of binary systems (On the course of the). 599. IT. 799. ILI. 906. 
ISOTHERMS of diatomic gases and their binary mixtures. VIII. The breaking stress of 
glass and the use of glass tubes in measurements under high pressure at ordinary 
and low temperatures, 30. 
Java (Contribution NO, [ to the knowledge of the flora of). 3rd Continuation. 129. 
4th Continuation. 158. NO, IIE. 415. 
JOULE-KELVINeffect (Researches on the) especially at low temperatures. I. Cal- 
culation for hydrogen. 863. IL, The JouLu-KeLvin-effect for air at 0°C. and at 
pressures up to 42 atmospheres. 874. 
yj ULIUS (W. H.), Anomalous refraction phenomena investigated with the spectro= 
heliograph. 213. 
— presents a paper of Mr. A. Bresrer Jz.: “The solar vortices of Hare”. 592. 
KAMERLINGH ONNES (H.). The liquefaction of helium. 168. 
— presents a paper of Mr. J. P. DarroN: “Researches on the JouLr-KeLvin-etlect 
especially at low temperatures. I. Calculation for hydrogen. 863. IL. The Jourr- 
KeuvinN-effect for air at 0° C. and at pressures up to 42 atmospheres”. 874. 
— Methods and apparatus used in the Cryogenic Laboratory. XV. An apparatus 
for the purification of gaseous hydrogen by means of liquid hydrogen. 883. 
KAMERLINGH ONNES (H.) and C. Braak. Isotherms of diatomic gases and their 
binary mixtures, VIII. The breaking stress of glass and the use of glass tubes in 
measurements under high pressure at ordinary and low temperatures. 30. 
