﻿A. 
  M. 
  Echvards 
  — 
  Infusorial 
  Earths 
  of 
  Pacific 
  Coast. 
  369 
  

  

  whereas 
  the 
  effect 
  of 
  temperature 
  in 
  experiments 
  like 
  the 
  

   above 
  is 
  manifest, 
  the 
  effect 
  of 
  pressures 
  of 
  the 
  order 
  applied 
  

   is 
  relatively 
  inappreciable. 
  

  

  21. 
  Digression. 
  — 
  From 
  the 
  above 
  paragraphs 
  I 
  infer 
  that 
  

   the 
  difficulty 
  encountered 
  in 
  endeavoring 
  to 
  dissolve 
  carbon 
  is 
  

   probably 
  attributable 
  to 
  a 
  relatively 
  high 
  dissociation 
  tempera- 
  

   ture 
  of 
  the 
  solid 
  carbon 
  molecule. 
  I 
  made 
  many 
  experiments 
  

   to 
  test 
  this 
  view, 
  in 
  all 
  of 
  which 
  I 
  failed 
  to 
  obtain 
  solution 
  

   even 
  at 
  low 
  red 
  heat 
  and 
  600 
  atm. 
  of 
  pressure. 
  My 
  work 
  thus 
  

   corroborates 
  the 
  negative 
  results 
  of 
  Hannay* 
  on 
  the 
  direct 
  so- 
  

   lution 
  of 
  carbon. 
  My 
  tests 
  were 
  made 
  with 
  gasolene, 
  water, 
  

   benzol 
  and 
  carbon 
  disulphide, 
  usually 
  at 
  500° 
  and 
  500 
  atm. 
  

   In 
  case 
  of 
  gasolene 
  I 
  observed 
  at 
  higher 
  temperatures. 
  Usu- 
  

   ally 
  the 
  reagents 
  were 
  decomposed 
  {particularly 
  CS 
  2 
  , 
  C 
  6 
  H 
  e 
  and 
  

   CHC1 
  3 
  ) 
  with 
  the 
  evolution 
  of 
  much 
  gas, 
  while 
  the 
  carbon 
  re- 
  

   mained 
  appreciably 
  unaffected. 
  Decomposition 
  by 
  metals 
  

   (copper 
  corroded 
  by 
  CS 
  2 
  , 
  and 
  gasolene 
  acted 
  on 
  by 
  palladium) 
  

   showed 
  sooty 
  deposits 
  only. 
  

  

  Art. 
  XXXY. 
  — 
  Report 
  of 
  the 
  Examination 
  by 
  Means 
  of 
  the 
  

   Microscope 
  of 
  Specimens 
  of 
  Infusorial 
  Earths 
  of 
  the 
  

   Pacific 
  Coast 
  of 
  the 
  United 
  States 
  / 
  by 
  Arthur 
  M. 
  Ed- 
  

   wards, 
  M.D. 
  

  

  Some 
  time 
  since 
  I 
  had 
  transmitted 
  to 
  me 
  by 
  Mr. 
  George 
  

   Gibbs, 
  the 
  geologist 
  of 
  the 
  Northwest 
  Boundary 
  Expedition, 
  a 
  

   collection 
  of 
  earths 
  gathered 
  at 
  different 
  points 
  on 
  the 
  Pacific 
  

   coast 
  of 
  the 
  United 
  States 
  in 
  the 
  states 
  of 
  Washington, 
  Oregon 
  

   and 
  California, 
  as 
  well 
  as 
  British 
  Columbia, 
  with 
  a 
  request 
  

   that 
  I 
  would 
  make 
  an 
  examination 
  of 
  them 
  by 
  means 
  of 
  the 
  

   microscope, 
  the 
  more 
  particularly 
  for 
  the 
  purpose 
  of 
  determin- 
  

   ing 
  the 
  characters 
  of 
  the 
  organic 
  remains 
  to 
  be 
  found 
  in 
  them. 
  

   Through 
  this 
  means 
  I 
  have 
  been 
  enabled 
  to 
  study 
  and 
  record 
  

   the 
  discovery 
  of 
  several 
  deposits 
  of 
  minute 
  organisms, 
  and 
  at 
  

   the 
  same 
  time 
  very 
  materially 
  assist 
  in 
  unraveling 
  the 
  geology 
  

   of 
  some 
  points 
  of 
  the 
  country 
  hitherto 
  found 
  to 
  be 
  somewhat 
  

   difficult 
  of 
  comprehension. 
  

  

  At 
  the 
  time 
  these 
  examinations 
  were 
  made, 
  that 
  is 
  to 
  say, 
  in 
  

   the 
  latter 
  part 
  of 
  the 
  year 
  1861, 
  very 
  little 
  was 
  known 
  concern- 
  

   ing 
  many 
  points 
  in 
  the 
  geology 
  of 
  our 
  Pacific 
  Coast, 
  and 
  my 
  

   own 
  experience 
  in 
  the 
  study 
  of 
  such 
  earths 
  had 
  been 
  rather 
  

   slight. 
  Hence, 
  when 
  1 
  made 
  my 
  report 
  in 
  1862, 
  I 
  was 
  unable 
  

  

  * 
  Hannay: 
  Proc. 
  Roy 
  Soc, 
  lxxx, 
  p. 
  188. 
  1880; 
  Chein. 
  News, 
  xli, 
  p. 
  106. 
  1880. 
  

   Cf. 
  Hannay 
  and 
  Hogarth: 
  Chem.'Xews. 
  xli, 
  p. 
  103, 
  1880; 
  Mallet 
  and 
  Hannay: 
  

   Nature, 
  xxii, 
  p. 
  192. 
  1880. 
  

  

  