INDEX. 



983 



Osmosis and osmotic pressure, on, 

 247, 396. 



Paints, on the stability of, 725 ; on 

 the transparency of, 729. 



Parkinson (J.) on the petrology and 

 physiography of W. Liberia, 495. 



Partial tones of stretched strings of 

 variable density, on the, 235. 



Periodic nongenerating force of high 

 frequency, on, 616. 



Permeameter, on the plug, 132. 



Pidduck (F. B.) on the genesis oi 

 ions by collision of positive and 

 negative ions in a gas, 280. 



Planetary temperatures, on, 462. 



Point discharge through hydrogen, 

 on the changes of pressure which 

 accompany, 24. 



Polarized light, on the emission of, 

 by fluorescent gases, 184. 



Positive rays, on, 657, 697. 



Potassium, on the radioactivity of, 

 377. 



Pressure-integral as kinetic poten- 

 tial, on a, 436. 



Preston (Dr. S. T.) on physical 

 relations affecting matter in 

 diverse stages of subdivision, 

 315. 



Radioactivity, on the, of potassium 

 and other alkali metals, 377. 



Radioelements, on the production of 

 helium from the primary, 513. 



Radiuin, on the, in deep-sea sedi- 

 ments, 190 ; on the volume of the 

 emanation from, 300 ; on the 

 spectrum of the emanation from, 

 313 ; on the amount of emanation 

 •of, in the atmosphere, 584, 622 ; 

 on the relation between uranium 

 and, 632 ; on the action of the 

 -emanation from, upon water, 812; 

 on the atomic weight of, 824. 



Radium C, on the secondary y rays 

 due to the y rays of, 224. 



Hayleigh (Lord) on the partial tones 

 of stretched strings of variable 

 density, 235 ; on the maintenance 

 ■of vibrations by impact of water 

 drops, 238; on discrimination 

 between sounds from directly in 

 front and directly behind the 

 •observer, 240 ; on the acousticon, 

 •241 ; on the pitch of sibilants, 

 244 ; notes on telephones, 244 ; 

 on reflexion from glass at the 

 .polarizing angle, 444. 



Reflexion from glass at the polariz- 

 ing angle, on, 444. 



Regener (Dr. E.) on the radiation 

 from radioactive bodies, 352. 



Relativity, on the principle of, 419, 

 423, 939. 



Resistance of a conductor whose 

 breadth suddenly changes, on the, 

 734. 



Resistances, on the variation of 

 manganin, with atmospheric 

 humidity, 450. 



Richardson (Prof. O. W.) on the 

 kinetic energy of the negative 

 electrons emitted by hot bodies, 

 353 ; on the specitic charge of the 

 ions emitted by hot bodies, 740 ; 

 on the kinetic energy of the ions 

 emitted by hot bodies, 890. 



Rontgen radiations, on homogeneous 

 secondary, 550. 



Royds (T.) on the spectrum of the 

 radium emanation, 313 ; on the 

 action of the radium emanation 

 upon water, 812. 



Rutherford (Prof. E.) on the volume 

 of the radium emanation, 300 ; 

 on the spectrum of the radium 

 emanation, 313 ; on the action of 

 the radium emanation upon water, 

 812. 



Sadler (C. A.) on homogeneous 

 secondary Rontgen radiations, 

 550. 



Satterly (J.) on the amount of 

 radium emanation in the atmo- 

 sphere, 584. 



Saturn, on the rings of, 949. 



Shunts, on the use of, with measur- 

 ing instruments, 137. 



Sibilants, on the pitch of, 244. 



Skinner (Prof. C. A.) on the optical 

 properties of films of magnetic 

 metals, 833. 



Smith (F. E.) on the variation of 

 manganin resistances with atmo- 

 spheric humidity, 450. 



Soddy (F.) on the production of 

 helium from the primary radio- 

 elements, 513; on the relation 

 between uranium and radium, 

 632. 



Sodium spectrum, extension of the 

 principal series of the, 945. 



Sounds, on the discrimination be- 

 tween, from in front and behind 

 the observer, 240. 



