﻿S24: 
  Dr. 
  H. 
  Wilde 
  on 
  the 
  Atomic 
  Weight 
  of 
  

  

  containing 
  37 
  per 
  cent. 
  of 
  the 
  salt. 
  This 
  solution 
  is 
  capable 
  

   of 
  solidification 
  at 
  —37° 
  C, 
  when 
  it 
  forms 
  the 
  solid 
  cryo- 
  

   hydrate 
  having 
  the 
  same 
  composition 
  as 
  itself. 
  But 
  it 
  may 
  

   be 
  cooled 
  somewhat 
  below 
  this 
  temperature, 
  and 
  then 
  if 
  it 
  is 
  

   touched 
  with 
  a 
  bit 
  of 
  ice 
  it 
  throws 
  up 
  ice, 
  if 
  it 
  is 
  touched 
  

   with 
  the 
  anhydrous 
  salt 
  it 
  throws 
  down 
  anhydrous 
  salt, 
  

   and 
  if 
  it 
  is 
  touched 
  with 
  the 
  cryohydrate 
  it 
  solidifies 
  into 
  

   cryohydrate. 
  

  

  LXX. 
  On 
  the 
  Atomic 
  Weight 
  of 
  Radium 
  and 
  other 
  

   Elementary 
  Substances. 
  

  

  Jo 
  the 
  Editors 
  of 
  the 
  Philosophical 
  Magazine. 
  

   Gentlemen, 
  

  

  IN 
  the 
  paper 
  which 
  you 
  were 
  good 
  enough 
  to 
  reprint 
  from 
  

   the 
  Memoirs 
  and 
  Proceedings 
  of 
  the 
  Manchester 
  

   Literary 
  and 
  Philosophical 
  Society 
  in 
  the 
  Magazine 
  of 
  

   February 
  last, 
  it 
  was 
  shown 
  from 
  the 
  definite 
  multiple 
  

   relations 
  of 
  the 
  first 
  and 
  second 
  series 
  of 
  elements, 
  Hn 
  and 
  

   H2n, 
  that 
  radium 
  was 
  the 
  next 
  higher 
  member 
  to 
  barium 
  of 
  

   the 
  alkaline 
  earth 
  metals, 
  with 
  an 
  atomic 
  weight 
  of 
  184 
  and 
  

   a 
  proximate 
  specific 
  gravity 
  of 
  5. 
  

  

  The 
  numerical 
  relations 
  of 
  these 
  series 
  are 
  of 
  so 
  much 
  

   interest 
  and 
  importance 
  to 
  chemical 
  science, 
  especially 
  in 
  

   regard 
  to 
  the 
  evolution 
  of 
  elementary 
  substances, 
  that 
  I 
  

   should 
  like 
  to 
  place 
  on 
  record 
  in 
  the 
  Philosophical 
  Magazine 
  

   the 
  method 
  by 
  which 
  the 
  atomic 
  weights 
  of 
  the 
  first 
  three 
  

   series 
  have 
  been 
  determined. 
  Also 
  my 
  complete 
  Table 
  of 
  the 
  

   elements 
  with 
  their 
  atomic 
  weights, 
  in 
  order 
  to 
  elucidate 
  

   the 
  subject 
  of 
  this 
  communication 
  and 
  for 
  future 
  reference. 
  

  

  Hn. 
  

  

  H2n. 
  

  

  H= 
  1 
  

  

  He= 
  2 
  

  

  . 
  . 
  7 
  =Li 
  = 
  7 
  

  

  0.0.8 
  = 
  G1 
  = 
  8 
  

  

  1x23.0 
  =Na= 
  23 
  

  

  lx24.0=Mg= 
  24 
  

  

  2x23-7 
  = 
  Ka= 
  39 
  

  

  2x24-8 
  =Ca= 
  40 
  

  

  3x23-7 
  =Cu= 
  62 
  

  

  3x24-8 
  =Zn= 
  64 
  

  

  4X23-7 
  = 
  Kb= 
  85 
  

  

  4x24-8 
  =Sr 
  = 
  78 
  

  

  5x23-7 
  =Ag= 
  108 
  

  

  5x24 
  -8=Cd=112 
  

  

  6x23-7 
  =Cs 
  =131 
  

  

  6x24-8 
  =Ba 
  =136 
  

  

  7x23-7 
  =.r 
  =154 
  

  

  7x24-8=* 
  =160 
  

  

  8x23-7 
  =x 
  =177 
  

  

  8x24-8=Ea 
  = 
  184 
  

  

  9x23-7 
  =Hg=200 
  

  

  9x24-8 
  =Pb 
  =207 
  

  

  It 
  will 
  be 
  seen 
  that 
  if 
  the 
  second 
  member 
  of 
  the 
  series 
  

   Hn 
  (Na23) 
  be 
  multiplied 
  by 
  an 
  arithmetical 
  series, 
  then 
  will 
  

  

  