x CO NT EON AS 
HOLLEMAN (A. F.) presents a paper of Prof. A. Smrrs and S. C, Bokuorsr: “The 
phenomenon of double melting of fats”. 681. 
— presents a paper of Prof. A. Smits and A. Kertner: “On the system ammonium 
sulphocyanate thioureum water”. 683. 
— presents a paper of Prof. A. Smirs, J. W. TERwWEN and Dr. H. L. DE Leeuw: 
“On the system phosphorus”. 885. 
— presents a paper of Mr. S. C. J. Oxtvrer and Prof. J. Bérsexen: “Dynamic 
researches concerning the reaction of FRIEDEL and Crarts”. 1069. 
— presents a paper of Dr. LL. K. Worrr and Dr. E. H. Bücuner: “On the behaviour 
of gels towards liquids and their vapours”. 1078, 
— presents a paper of Dr. F. E. C. Scuerrer: ‘On velocities of reaction and 
equilibria”. 1109. 
— presents a paper of Dr. F. E, C. Scnerrer: “On the velocity of substitutions 
in the benzene nucleus”. 1118. 
— and J. P. Wisaur. On the nitration of the chlorotoluenes. 594. 
HOLMES (Researches on the orbit of the periodic comet) and on the perturbations 
of its elliptic motion. V. 192. 
HOOGENBOOM (C. M.) and P, ZEEMAN. Electric double refraction in some artificial 
clouds and vapours. 178. 
HOOGENHUYZE (Cc. J. C. VAN) and J, NrIEUWENHUYsE. Influence of the seasons 
on respiratory exchange during rest and during muscular exercise. 790. 
HYBRIDS (Some correlation phenomena in). 1004, 
HYDROGEN (Control measurements with the volumenometer of the compressibility of) 
at 20° C. 295. 
— (On the second virial coefficient for monatomic gases and for) below the Boyrr- 
point. 643. 
HYDROGEN- VAPOUR (‘The compressibility of) at and below the boiling point. 405. 
HYDROXYL GROUPS (On a method for a more exact determination of the position of 
the) in the polyoxycompounds. 216. 
IMINO COMPOUNDs (Contribution to the knowledge of the direct nitration of aliphatic). 207 
INTEGRALS (Homogeneous linear differential equations of order two with given relation 
between two particular). 5th Communication. 2. 
— (New researches upon the centra of the) which satisfy differential equations of 
the first order and the first degree. 2nd part. 46. 
INVOLUTION (An) of associated points. 1263. 
IRON-CARBON (The inverse occurrence of solid phases in the system). 371. 
ISOTHERMS of monatomic substances and of their binary mixtures. XIÌL. The empirical 
reduced equation of state for argon. 273. XIV. Calculation of some thermal 
quantities for argon. 952. 
— of diatomic gases and of their binary mixtures. X. Control measurements with 
the volumenometer of the compressibility of hydrogen at 20° C. 295. XI. On 
the determination of the compressibility of gases under small pressures and at 
low temperatures. 299. 
