INDEX. 
839 
Radioactive  substances,  on  the  ab- 
sorption of  the  y  rays  of,  50b'. 
Radioactivity,  on  the  relation  be- 
tween the,  and  composition  of 
uranium  compounds,  176. 
Radiothoriurn,  on  the  a  rays  from, 
793 
Radium,  on  the  properties  of  the 
a  rays  from,  131,  166  ;  on  the  rate 
of  decay  of  the  active  deposit 
frun,  143:  on  the  absorption  of 
the  y  rays  from,  5S8- 
Rankine  (A.  O.)  on  the  decay  of 
torsional  stress  in  solutions  of 
gelatine,  447. 
Rastall  (R.  H.)  on  the  Buttermere 
and  Ennerdale  granophyre,  615. 
Rayleigh  (Lord)  on  electrical  vibra- 
tions and  the  constitution  of  the 
atom,  117,  292  ;  on  the  constitu- 
tion of  natural  radiation,  123  ;  on 
an  instrument  for  compounding 
vibrations,  127  ;  on  the  production 
of  vibrations  by  forces  of  long 
duration,  283  ;  on  some  measure- 
ments of  wave-lengths  with  a 
modified  apparatus,  685. 
Resolving  power  of  spectroscopes,  on 
the,  414. 
Resonance-curves,  on  the  use  of  the 
cymometer  for  the  determination 
of,  665. 
Revolution,  on  the  symmetrical  vi- 
brations of  conducting  surfaces  of, 
703. 
Reynolds  (Prof.  S.  IT.)  on  the  igneous 
rocks  of  the  Eastern  Mendips, 
616. 
Rontgen  radiation,  on  the  heating 
produced  by,  in  different  metals, 
292  :  on  secondary,  812. 
Ropes,  on  winding,  in  mines,  107. 
Russell  (A.)  on  the  dielectric  strength 
of  air,  237. 
Rutherford  (Prof.  E.)  on  some  pro- 
perties of  the  a  rays  from  radium, 
166 ;  on  the  retardation  of  the 
velocity  of  the  a  particles  in  pass- 
ing through  matter,  553. 
Salt  vapours,  on  the  electrical  con- 
ductivity of  flames  containing,  for 
alternating  currents,  484  :  on  the 
velocities  of  the  ions  of  alkali, 
790. 
Saponine  solutions,  on  the  surface 
elasticity  of.  317. 
Schwarz    (Prof.  E.  II.   L.)  on    the 
coast-ledges  in  the  south-west  of 
Cape  Colony,  188. 
Ship- waves,  on  deep  sea,  1. 
Shorter  (S.  A.)  on  the  surface-elasti- 
city of  saponine  solutions,  317. 
Slater  (Miss  I.  L.)  on  the  Silurian 
rocks  of  the  Ludlow  district,  421. 
Sodium  peroxide,  on  the  electrical 
conductivity  of,  523. 
Solutions,  on  electrically  prepared 
colloidal,  425  ;  on  the  osmotic 
pressures  of  alcoholic,  595. 
Spectroscopes,  on  the  resolving  power 
of,  414. 
Spectrum,  on  the  Faraday  and  Kerr 
effects  in  the  infra-red,  41. 
Sphere,  on  the  diffraction  of  short 
waves  by  a  rigid,  193. 
Steel,  on  the  effect  of  combined 
stresses  on  the  elastic  properties 
of,  276. 
Stevenson  (J.)  on  the  chemical  and 
geological  history  of  the  atmo- 
sphere, 226. 
Sumpner  (Dr.  W.  E.)  on  the  theory 
of  phasemeters,  81. 
Surfaces  of  revolution,  on  the  sym- 
metrical vibrations  of  conducting, 
703. 
Swinton  (A.  A.  C.)  on  an  experiment 
with  the  electric  arc,  829. 
Talbot's  lines,  note  on,  531. 
Tap,  on  a  non-leaking  glass,  379, 
728. 
Tensile  overstrain  and  recovery  of 
aluminium,  copper,  and  aluminium- 
bronze,  on,  380, 
Thermodynamics,  notes  on,  678. 
Thomas  (H.  H.)  on  the  igneous  and 
associated  sedimentary  rocks  of 
Llangynog,  614. 
Thomson  (Prof.  J.  J.)  on  the  number 
of  corpuscles  in  an  atom,  769. 
Thorium,  on  the  absorption  of  the 
y  rays  from,  589;  on  the  a  particles 
of,  754. 
Tomlinson  (G.  A.)  on  tensile  over- 
strain and  recovery  of  aluminium, 
copper,  and  aluminium-bronze,  380. 
Torsional  stress,  on  the  decay  of,  in 
solutions  of  gelatine,  447. 
Townsend  (Prof.  J.  S.)  on  the  field 
of  force  in  a  discharge  between 
parallel  plates,  729. 
Uranium,  on  the  absorption  of  the 
y  rays  from,  590  ;  on  the  a  par- 
ticles of,  754. 
