I  N  D  E  X. 
837 
by  an  oscillating  electric  needle, 
402  ;     motion    of     particles     in, 
431. 
Electric  vibrations  and   the  consti- 
tution of  the  atom,  on,  117,  29*2. 
Electrically  prepared  colloidal  solu- 
tions, on,  425. 
Electrodes,    on   the    disruptive    dis- 
charges for  large  spherical,  271 ; 
on  the  asymmetrical  action  of  an 
alternating  current  upon  polariz- 
able,  329. 
Electromagnetic  rotary  dispersion, 
on,  41. 
Elles  (Miss  G.  L.)  on  the  Silurian 
rocks  of  the  Ludlow  district,  421. 
Ellipsoidal  potentials,  on  some,  568. 
Evans  (Dr.  J.  W.)  on  the  rocks  of 
the  cataracts  of  the  river  Madeira, 
190. 
Eve  (A.  S.)  on  the  absorption  of  the 
y  rays  of  radioactive  substances, 
586. 
Faraday  effect  in  the  infra-red  spec- 
trum, on  the,  41. 
Field  of  force  in  a  discharge  between 
parallel  plates,  on  the,  729. 
Films,  on  the  black  spot  in  thin 
liquid,  746. 
Flames,  on  the  electrical  conductivity 
of,  containing  salt  vapours  for 
alternating  currents,  484. 
Fleming  (Prof.  J.  A.)  on  oscillation 
valves  for  rectifying  high-frequency 
currents,  659. 
Fluid,  on  the  inversion-points  for  a, 
passing  through  a  porous  plug,  554. 
Fluorescence  and  Lambert's  law,  on, 
782. 
Focometry  of  concave  lenses  and 
convex  mirrors,  on  the,  789. 
Gamma  rays,  on  the  absorption  of 
the,  586. 
Gases,  on  the  dynamical  theory  of, 
455  ;  on  the  recombination  of  ions 
in,  466  ;  theory  of  the  conductivity 
of  ionized,  for  alternating  currents, 
497  ;  on  the  ionization  of  various, 
by  the  a  particles  of  radium,  617. 
Gelatine,  on  the  decay  of  torsional 
stress  in  solutions  of,  447. 
Geological  Society,  proceedings  of 
the,  188,  421,  614. 
Gold  (E.)  on  the  electrical  con- 
ductivity of  flames  containing  salt 
vapours  for  alternating-  currents 
481. 
Gundry  (Dr.  P.  G.)  on  the  asym- 
metrical action  of  an  alternating 
current  on  a  polarizable  electrode, 
329. 
Gwyther  (R.  F.)  on  the  range  of 
Stokes's  deep-water  weaves,  374. 
II  theorem,  on  the,  455. 
Halm  (Dr.  O.)  on  the  a  rays  from 
radiothorium,  793. 
Hancock  (E.  L.)  on  the  effect  of 
combined  stresses  on  the  elastic 
properties  of  steel,  276. 
Hargreaves  (R.)  on  some  ellipsoidal 
potentials,  aeolotropic  and  isotropic, 
568. 
Harker  (A.)  on  the  geological 
structure  of  the  Sgurr  of  Ei gg, 
192. 
Harmonic  analysis,  on  a  practical 
method  of,  25. 
Hawthorne  (W.)  on  the  deflexions 
caused  by  a  break  in  an  overhead 
wire  carried  on  poles,  632. 
Heating  effect  produced  by  Eontgen 
ravs  in  different  metals,  on  the, 
292. 
High-frequency  currents,  on  oscilla- 
tion valves  for  rectifying,  659. 
Llorton  (Dr.  F.)  on  the  electrical 
conductivity  of  metallic  oxides, 
505. 
Hull  (Prof.  E.)  on  the  physical 
history  of  the  great  pleistocene 
lake  of  Portugal,  191. 
Hurst  (H.  E.)  on  the  genesis  of  ions 
by  collision  and  sparking-poten- 
tials  in  carbon  dioxide  and 
nitrogen,  535. 
Infra-red  spectrum,  on  the  Faraday 
and  Kerr  effects  in  the,  41. 
Ingersoll  (L.  K.)  on  the  Faraday  and 
Kerr  effects  in  the  infra-red  spec- 
trum, 41. 
Inglis  (J.  K.  H.)  on  the  isothermal 
distillation  of  nitrogen  and  oxygen 
and  of  argon  and  oxygen,  640. 
Inversion-points  for  a  fluid  passing- 
through  a  porous  plug1,  on  the, 
554. 
Ionization  of  various  gases  by  the  a 
particles  of  radium,  on  the.  617; 
on  the,  produced  by  a  rays,  806. 
Ions,  on  the  recombination  of,  in  air 
and  other  gases,  466  ;  on  the 
genesis  of,  by  collision,  535 ;  on 
the  velocities  of  the,  of  alkali  salt 
vapours,  790. 
