INDEX. 



'81 



Lines and planes, of closest fit, on, 

 367. 



Liquids, on the measurement of the 

 refractive index of, 301 ; on the 

 motion of solid bodies through 

 viscous, 697. 



Livens (G. H.) on the initial accele- 

 rated motion of an electrified 

 sphere, 640. 



Lotka (A. J.) on a problem of age- 

 distribution, 435. 



McLaren (S. B.) on Hamilton's 

 equations and the partition of 

 energy between matter and radi- 

 ation, 15. 



Magnetic fields, on the change of 

 resistance of iron and nickel wires 

 in strong, 122. 

 testing, on, 1. 



Magnetostriction, on, 78. 



Mauchly (S. J.) on a new form of 

 earth inductor, 579. 



Membrane, on Bessel's functions as 

 applied to the vibrations of a 

 circular, 53. 



Mercury, on the influence upon the 

 fluorescence of, of gases with 

 different affinities for electrons, 

 314. 



arc, on the ultra-violet light 



from the, 393. 



lamp, on extremely long waves 



emitted by the, 689. 



Merton (T. R.) on a method of cali- 

 brating fine capillary tubes, 386. 



Meservey (A. B.) on the potentials 

 required to produce discharge in 

 gases, 479. 



Metallic colouring in birds and in- 

 sects, on, 554. 



Metals, on the heat liberated during 

 the absorption of electrons bv, 

 404. 



Michelson (Prof. A. A.) on metallic 

 colouring in birds and insects, 

 554. 



Millikan (Prof. R. A.) on the ques- 

 tion of valency in gaseous ioni- 

 zation, 753. 

 Minerals, on the ratio between ura- 

 nium and radium in, 652. 

 Mitchell (H.) on the ratios which 

 the amounts of substances in radio- 

 active equilibrium bear to one 

 another, 40. 

 Mixture, on the heat of, of sub- 



Molecules, on the heat of mixture of 

 substances and the relative distri- 

 bution of, 535. 



More (Prof. L. TV. on the recent 

 theories of electricity, 186. 



Nicholson (Dr. J. W.) on the bend- 

 ing of electric waves round a large 

 sphere, 62, 281 ; on the damping 

 of the vibrations of a dielectric 

 sphere, 438. 



Nickel wires, on the change of re- 

 sistance of, in strong magnetic, 

 fields, 122. 



Oscillations of chains, on the, 736. 



Owen (E. A.) on the change of re- 

 sistance of iron and nickel wires 

 in strong magnetic fields, 122. 



Owen (Dr. G.) on condensation 

 nuclei produced by the action of 

 light on iodine vapour, 465. 



Oxl ey (A. E.) on apparatus for the 

 production of circularly polarized 

 light, 517. 



Pealing (H.) on condensation nuclei 

 produced by the action of light on 

 iodine vapour, 465. 



Peltier effect, on the direct measure- 

 ment of the, 454. 



Periodic motion, on the maintenance 

 of, by solid friction, 161. 



Photoelectric effect, on the normal y , 

 and the selective, 155. 



Pirret (Miss R.) on the ratio between 

 uranium and radium in minerals, 

 652. 



Pitchblende, on the rate of evolution 

 of heat by, 58. 



Pitot constant, on the value of the, 

 348. 



Planes of closest fit, on, 367. 

 latinum -black 

 power of, 167 



Pohl (Dr. R.) on the normal and 

 the selective photoelectric effect, 

 155. 



Point, on the discharge from an 

 electrified, 585. 



Polarized light, on apparatus for the 

 production of circularly, 517. 



Polonium, on the ionization of dif- 

 ferent gases by the alpha particles 

 from, 571. 



Poole (II. II.) on the rate of evolu- 

 tion of heat by pitchblende, 58. 



Positive electricity, on the rays o\\ 

 225 ; on the discharge of, from 

 hot bodies, 634. 



