﻿Aepinus 
  Atomized, 
  271 
  

  

  their 
  mutual 
  influence 
  is 
  negligible, 
  is 
  the 
  same 
  as 
  that 
  o£ 
  

   an 
  equal 
  and 
  similar 
  assemblage 
  of 
  our 
  hypothetical 
  atoms, 
  

   whatever 
  be 
  the 
  number 
  of 
  electrions 
  in 
  each, 
  not 
  necessarily 
  

   the 
  same 
  in 
  all. 
  Hence 
  our 
  hypothetical 
  atom 
  realizes 
  

   perfectly 
  for 
  sparse 
  assemblages 
  Faraday's 
  suggestion 
  of 
  

   " 
  small 
  globular 
  conductors, 
  as 
  shot 
  " 
  to 
  explain 
  the 
  electro- 
  

   polarization 
  which 
  he 
  discovered 
  in 
  solid 
  and 
  liquid 
  insulators. 
  

   (Experimental 
  Researches, 
  § 
  1679.) 
  

  

  § 
  21. 
  Denoting 
  now 
  by 
  N 
  the 
  number 
  of 
  atoms 
  per 
  unit 
  

   volume 
  we 
  find 
  NVa 
  3 
  F 
  as 
  the 
  electric 
  moment 
  of 
  any 
  sparse 
  

   enough 
  assemblage 
  of 
  uniform 
  density 
  occupying 
  volume 
  V 
  

   in 
  a 
  uniform 
  electric 
  field 
  of 
  intensity 
  F. 
  Hence 
  Na 
  3 
  is 
  what 
  

   (following 
  the 
  analogy 
  of 
  electromagnetic 
  nomenclature) 
  we 
  

   may 
  call 
  the 
  electro-inductive 
  susceptibility* 
  of 
  the 
  assem- 
  

   blage 
  ; 
  being 
  the 
  electric 
  moment 
  per 
  unit 
  bulk 
  induced 
  by 
  

   an 
  electric 
  field 
  of 
  unit 
  intensity. 
  Denoting 
  this 
  by 
  /-t, 
  and 
  

   the 
  electro-inductive 
  permeability 
  by 
  co, 
  we 
  have 
  (Electro- 
  

   statics 
  and 
  Magnetism, 
  § 
  629 
  (14)) 
  

  

  0)=l 
  + 
  47T^ 
  = 
  l+3 
  (n^-) 
  

  

  which 
  proves 
  the 
  proposition 
  stated 
  at 
  the 
  commencement 
  

   of 
  § 
  23. 
  

  

  § 
  25. 
  To 
  include 
  vibrating 
  and 
  rotating 
  groups 
  of 
  elec- 
  

   trions 
  in 
  the 
  demonstration, 
  it 
  is 
  only 
  necessary 
  to 
  remark 
  

   that 
  the 
  time-average 
  of 
  any 
  component 
  of 
  the 
  displacement 
  

   of 
  the 
  centre 
  of 
  inertia 
  of 
  the 
  group 
  relatively 
  to 
  the 
  centre 
  

   of 
  the 
  atom 
  will, 
  under 
  the 
  influence 
  of 
  F, 
  be 
  the 
  same 
  as 
  if 
  

   the 
  assemblage 
  were 
  at 
  rest 
  in 
  stable 
  equilibrium. 
  

  

  § 
  26. 
  The 
  consideration 
  of 
  liquids 
  consisting 
  of 
  closely 
  

   packed 
  mobile 
  assemblages 
  of 
  atoms 
  or 
  groups 
  of 
  atoms 
  with 
  

   their 
  electrions, 
  forming 
  compound 
  molecules, 
  as 
  in 
  liquid 
  

   argon 
  or 
  helium 
  (monatomic), 
  nitrogen, 
  oxygen, 
  &c. 
  (dia- 
  

   tomic), 
  or 
  pure 
  water, 
  or 
  water 
  with 
  salts, 
  or 
  other 
  chemical 
  

   substances 
  dissolved 
  in 
  it, 
  or 
  liquids 
  of 
  various 
  complex 
  

   chemical 
  constitutions, 
  cannot 
  be 
  entered 
  on 
  in 
  the 
  present 
  

   communication, 
  further 
  than 
  to 
  remark 
  that 
  the 
  suppositions 
  

   we 
  have 
  made 
  regarding 
  forces, 
  electric 
  and 
  other, 
  between 
  

   electrions 
  and 
  atoms, 
  seem 
  to 
  open 
  the 
  way 
  to 
  a 
  very 
  definite 
  

   detailed 
  dynamics 
  of 
  electrolysis, 
  of 
  chemical 
  affinity, 
  and 
  of 
  

   heat 
  of 
  chemical 
  combination. 
  Estimates 
  of 
  the 
  actual 
  

   magnitudes 
  concerned 
  (the 
  number 
  of 
  molecules 
  per 
  cubic 
  

   centimetre 
  of 
  a 
  gas, 
  the 
  mass 
  in 
  grammes 
  of 
  an 
  atom 
  of 
  any 
  

   substance, 
  the 
  diameters 
  of 
  the 
  atoms, 
  the 
  absolute 
  value 
  of 
  

   the 
  electric 
  quantity 
  in 
  an 
  electrion, 
  the 
  effective 
  mass 
  or 
  

   * 
  Suggested 
  in 
  my 
  < 
  Electrostatics 
  and 
  Magnetism/ 
  §§ 
  628, 
  629. 
  

  

  