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  INDEX 
  TO 
  VOL. 
  XVIII 
  

  

  Abbot 
  (C. 
  G.) 
  on 
  the 
  theory 
  of 
  

  

  the 
  greenhouse^ 
  32. 
  

   Absorption 
  of 
  mercury 
  vapour, 
  on 
  

   the, 
  240 
  ; 
  of 
  sodium 
  vapour, 
  on 
  

   the, 
  530. 
  

   ActiniuD?^ 
  on 
  the 
  active 
  deposit 
  from, 
  

  

  744. 
  

   ^ther, 
  on 
  the 
  structure 
  of 
  the, 
  872. 
  

   Air, 
  on 
  the 
  recombination 
  of 
  the 
  ions 
  

  

  in, 
  at 
  different 
  temperatures, 
  328. 
  

   Airy's 
  integral, 
  on 
  the 
  relation 
  of, 
  

  

  to 
  the 
  Bessel 
  functions, 
  6. 
  

   Alpha 
  rays, 
  on 
  the 
  retardation 
  of, 
  

  

  by 
  metals 
  and 
  gases, 
  604. 
  

   Alternating 
  current 
  generator, 
  on 
  

   the 
  theory 
  of 
  the, 
  45 
  ; 
  spark 
  poten- 
  

   tials, 
  on, 
  699. 
  

   Alty 
  (J. 
  N.) 
  on 
  an 
  electromagnetic 
  

   device 
  for 
  studying 
  the 
  theory 
  of 
  

   and 
  solving 
  algebraical 
  equations, 
  

   802. 
  

   Aluminium 
  phosphate, 
  on 
  the 
  kinetic 
  

   energy 
  of 
  the 
  positive 
  ions 
  emitted 
  

   from, 
  663. 
  

   Anomalous 
  dispersion 
  of 
  mercury 
  

   vapour, 
  on 
  the, 
  249; 
  by 
  metallic 
  

   vapours, 
  on, 
  407. 
  

   Argon, 
  on 
  the 
  amount 
  of, 
  in 
  mala- 
  

  

  cone, 
  672. 
  

   Atomic 
  disintegration, 
  on 
  multiple, 
  

  

  739. 
  

   Backlash, 
  on 
  a 
  device 
  to 
  prevent, 
  

  

  336. 
  

   Balance, 
  on 
  a 
  method 
  of 
  deter- 
  

   mining 
  the 
  sensibility 
  of 
  a, 
  132 
  ; 
  on 
  

   the, 
  as 
  a 
  sensitive 
  barometer, 
  135. 
  

   Barometer, 
  on 
  the 
  balance 
  as 
  a 
  sensi- 
  

   tive, 
  135. 
  

   Bars, 
  on 
  the 
  lateral 
  deflexion 
  and 
  

  

  vibration 
  of, 
  452. 
  

   Barton 
  (Prof. 
  E. 
  H.) 
  on 
  the 
  vibra- 
  

   tion 
  curves 
  of 
  violin 
  G 
  stnng 
  and 
  

   belly, 
  233. 
  

   Bateman 
  (H.) 
  on 
  the 
  reflexion 
  of 
  

   light 
  at 
  an 
  ideal 
  plane 
  mirror 
  

   moving 
  with 
  a 
  uniform 
  velocity, 
  

   890. 
  

   Berkeley 
  (the 
  Earl 
  of) 
  on 
  the 
  influ- 
  

   ence 
  of 
  gravity 
  on 
  a 
  binary 
  solu- 
  

   tion, 
  340. 
  

  

  Bessel 
  functions, 
  on 
  the 
  relation 
  of 
  

  

  Airy's 
  integral 
  to 
  the, 
  6. 
  

   Beta 
  rays 
  of 
  radium, 
  on 
  the 
  scatter- 
  

   ing 
  of 
  the, 
  909. 
  

   Be 
  van 
  (P. 
  V.) 
  on 
  anomalous 
  dis- 
  

   persion 
  by 
  metallic 
  vapours, 
  407. 
  

   Blanc 
  (Dr. 
  G. 
  A.) 
  on 
  the 
  distribution 
  

   of 
  thorium 
  in 
  the 
  earth's 
  surface 
  

   material:?, 
  146. 
  

   Books, 
  new 
  :— 
  Bouasse's 
  Coiirs 
  de 
  

   Physique, 
  vols, 
  ii., 
  iv., 
  & 
  v., 
  227 
  ; 
  

   Friend's 
  The 
  Theory 
  of 
  Valency, 
  

   227 
  ; 
  Transactions 
  of 
  the 
  Inter- 
  

   national 
  Union 
  for 
  Cooperation 
  in 
  

   Solar 
  Research, 
  vol. 
  ii., 
  228 
  ; 
  

   Bromwich's 
  Introduction 
  to 
  the 
  

   Theory 
  of 
  Infinite 
  Series, 
  338 
  ; 
  

   Hardy's 
  Course 
  of 
  Pure 
  Mathe- 
  

   matics, 
  338 
  ; 
  Durell's 
  Plane 
  Geo- 
  

   metry, 
  238 
  ; 
  Beattie's 
  Report 
  of 
  a 
  

   Magnetic 
  Survey 
  of 
  South 
  Africa, 
  

   818. 
  

   Bromine, 
  on 
  ionization 
  in, 
  878. 
  

   Brown 
  (Dr. 
  F. 
  C.) 
  on 
  the 
  kinetic 
  

   energy 
  of 
  the 
  positive 
  ions 
  emitted 
  

   from 
  hot 
  bodies, 
  649. 
  

   Burton 
  (Dr. 
  C. 
  V.) 
  on 
  the 
  influence 
  

   of 
  gravity 
  on 
  a 
  binary 
  solution, 
  

   340 
  ; 
  on 
  the 
  apparent 
  dispersion 
  

   of 
  light 
  in 
  space 
  and 
  the 
  minute- 
  

   ness 
  of 
  structure 
  of 
  the 
  aether, 
  872. 
  

   Cadmium 
  spectrum, 
  on 
  a 
  method 
  of 
  

  

  producing 
  an 
  intense, 
  320. 
  

   Cameron 
  (A. 
  T.) 
  on 
  the 
  electro- 
  

   motive 
  forces 
  produced 
  by 
  acid 
  

   and 
  alkaline 
  solutions 
  streaming 
  

   through 
  glass 
  capillary 
  tubes, 
  586. 
  

   Campbell 
  (A.) 
  on 
  a 
  method 
  of 
  testing- 
  

   photographic 
  shutters, 
  782 
  ; 
  on 
  

   the 
  measurement 
  of 
  wave-length 
  

   for 
  high-frequency 
  electrical 
  oscil- 
  

   lations, 
  794. 
  

   Canal, 
  on 
  the 
  decay 
  of 
  waves 
  in 
  a, 
  

  

  483. 
  

   Canalstralilen,on 
  a 
  method 
  of 
  mea- 
  

   suring 
  the 
  effective 
  magnetic 
  field 
  

   in 
  the 
  magnetic 
  deflexion 
  of 
  the, 
  

   844. 
  

   Candle-power, 
  on 
  the 
  international 
  

   unit 
  of, 
  263. 
  

  

  