CAO NG TE Ee Ne Ls VIT 
ELECTRIC FIELD (On the influence of an) on the light transmitted and dispersed by 
elouds. 415. 
ELECTRIC RESISTANCE (On the) of thin films of metal. 597. 
ELECTRICAL phenomeron (The) in cloudlike condensed odorous water vapours. 44. 
— (The) in smell-mixtures. 551. 
ELECTROLYTE SOLUTIONS (Current potentials of). 2nd Communication. 1021. 
ELECTROLYTIC phenomena of the molybdenite-detector. 512. 
ELECTRO-MAGNETIC and of the gravitational field (The virtual re of the) in 
applications of HAMILTON’s variation principle. 968. 
ELECTROMOTIVE equilibria (The application of the theory of allotropy to). V. 133. 
ELECTRON (On the energy and the radius of the). 985. 
ELECTRONS (The equations of the theory of) in a gravitation field of ErnsreiN deduced 
from a variation principle. 892. 
ELEMENTS (On the fundamental values of the quantities 4 and g/a for different) in 
connection with the periodic system. IL. 2. IIL. 287. IV. 295. ; 
ENERGY (On the) and the radius of the electron. 985. 
ENTROPY-CONSTANT (Note on P. ScHERRER's calculation of the). 544, 
ENZYME theory of heredity. 1275. 
EQUATION OF STATE (The increase of the quantity a of the) for densities greater than 
the critical density. 359. 
— (On the) of water and of ammonia, 932, 
— (The influence of accidental deviations of density on the). 1312. 
EQUILIBRIA (Iu-, mono- and divariant). X. 514. XL. 713. XII. 816. XIII. 867. XIV. 
927. XV.-999.- XVI. 1196) X VER+1205. 
— (On the influence of temperature on chemical). 636. 
EQUILIBRIUM (On the influence of the solvent on the situation of the homogeneous). I. 708. 
— solid-liquid gas (The) in binary systems which present mixed crystals. 3rd 
comm. 439. 4th comm. 555. 
EULER (On some numerical series considered by). 275. 
EVAPORATION (Ultramicroscopic investigation of ike thin metal and saltfilms obtained 
by) in high vacuum. 958. 
EYES (An exact method for the determination of the position of the) at disturbances 
of motion. 778. 
FEENSTRA (T. P.). A new group of antagonizing atoms. I. 99. IL. 341. 
— in collaboration with Prof. H. ZWAARDEMAKER. Radium as a substitute, to an 
equiradio-active amount, for Potassium in the so-called physiological fluids. 633. 
FIBRIN-EXCRETION under the influence of an electric current. 900. 
FIZEAU’s experiment (Direct optical measurement of the velocity at the axis in 
the apparatus for). 125. 
FOKKER (a. D.). The virtual displacements of the electromagnetic and of the gravita- 
tional field in applications of Hami.ton’s variation principle. 968. 
Fossa sYLVII (The development of the) in embryos of Semnopithecus. 938. 
FREQUENCY curves (Skew). 670. 
FROG's heart (Researches on the function of the sinus venosus of the). 455, 
