﻿James 
  Divight 
  Dana. 
  339 
  

  

  its 
  full 
  place. 
  In 
  this 
  edition, 
  moreover, 
  the 
  other 
  parts 
  of 
  the 
  

   work 
  were 
  put 
  in 
  new 
  and 
  better 
  form, 
  containing 
  the 
  result 
  

   of 
  much 
  thought 
  on 
  crystallogeny 
  and 
  homoeomorphism. 
  The 
  

   fifth 
  edition 
  (1868), 
  which 
  includes 
  only 
  the 
  description 
  of 
  

   species, 
  is 
  a 
  monumental 
  work 
  — 
  the 
  most 
  complete 
  treatise, 
  

   indeed, 
  that 
  had 
  ever 
  been 
  attempted. 
  In 
  it 
  the 
  classification 
  

   was 
  still 
  further 
  developed, 
  the 
  nomenclature 
  simplified 
  and 
  

   systematized, 
  and 
  in 
  connection 
  with 
  the 
  latter 
  subject 
  an 
  

   exhaustive 
  review 
  of 
  the 
  entire 
  mineralogical 
  literature 
  from 
  

   the 
  beginning 
  was 
  made 
  in 
  order 
  to 
  unravel 
  the 
  vexed 
  ques- 
  

   tions 
  of 
  the 
  history 
  and 
  priority 
  of 
  mineral 
  names. 
  This 
  last 
  

   feature 
  of 
  the 
  volume 
  was 
  a 
  labor 
  involving 
  great 
  patience 
  and 
  

   skill. 
  It 
  was 
  in 
  recognition 
  of 
  this 
  work 
  that 
  he 
  received 
  the 
  

   degree 
  of 
  Doctor 
  of 
  Philosophy 
  from 
  the 
  University 
  of 
  Munich 
  

   in 
  1870. 
  In 
  the 
  sixth 
  edition 
  of 
  the 
  System 
  (1892), 
  by 
  his 
  son, 
  

   he 
  took 
  a 
  lively 
  interest, 
  but 
  was 
  unable 
  to 
  cooperate 
  in 
  the 
  

   labor 
  actively, 
  in 
  consequence 
  of 
  the 
  condition 
  of 
  his 
  health 
  ; 
  

   even 
  the 
  reading 
  of 
  the 
  final 
  proofs, 
  though 
  attempted, 
  had 
  to 
  

   be 
  soon 
  given 
  up. 
  

  

  Besides 
  the 
  System, 
  he 
  also 
  issued 
  a 
  small 
  work, 
  called 
  the 
  

   Manual 
  of 
  Mineralogy, 
  which 
  has 
  passed 
  through 
  four 
  editions 
  

   (1848, 
  1857, 
  1878, 
  1887). 
  The 
  pages 
  of 
  this 
  Journal 
  also 
  con- 
  

   tain, 
  particularly 
  down 
  to 
  1868, 
  many 
  papers 
  on 
  mineralogical 
  

   topics 
  ; 
  his 
  last 
  paper 
  in 
  this 
  field 
  was 
  published 
  in 
  1874. 
  The 
  

   subjects 
  that 
  interested 
  him 
  were, 
  for 
  the 
  most 
  part, 
  those 
  of 
  a 
  

   general 
  and 
  philosophical 
  nature, 
  such 
  as 
  questions 
  of 
  classifica- 
  

   tion, 
  theories 
  of 
  crystallogeny, 
  and 
  the 
  morphological 
  relations 
  

   of 
  species. 
  In 
  the 
  points 
  connected 
  with 
  the 
  descriptions 
  of 
  

   individual 
  species 
  he 
  took 
  less 
  interest, 
  though 
  his 
  observations 
  

   here 
  were 
  numerous 
  and 
  important. 
  

  

  Mineralogy, 
  however, 
  did 
  not 
  afford 
  scope 
  enough 
  for 
  a 
  mind 
  

   so 
  active, 
  indeed 
  he 
  often 
  spoke 
  of 
  it 
  as 
  a 
  department 
  of 
  limited 
  

   ideas 
  and 
  principles. 
  To 
  the 
  broader 
  field 
  of 
  Geology 
  and 
  

   geological 
  investigation, 
  he 
  had 
  been 
  early 
  turned 
  by 
  his 
  labors 
  

   for 
  the 
  Exploring 
  Expedition, 
  the 
  results 
  of 
  which 
  have 
  been 
  

   already 
  mentioned. 
  

  

  The 
  several 
  editions 
  of 
  the 
  Manual 
  of 
  Geology 
  (1862, 
  1874, 
  

   1880, 
  1895) 
  have 
  been 
  briefly 
  alluded 
  to. 
  To 
  the 
  many 
  geolo- 
  

   gists 
  familiar 
  with 
  this 
  work, 
  it 
  is 
  unnecessary 
  to 
  remark 
  that, 
  

   like 
  the 
  System 
  of 
  Mineralogy, 
  it 
  is 
  not 
  simply 
  a 
  compilation 
  

  

  