﻿334 
  James 
  L 
  ) 
  wight 
  Dana. 
  

  

  In 
  June, 
  1842, 
  Mr. 
  Dana 
  returned 
  to 
  the 
  United 
  States 
  and 
  

   for 
  the 
  next 
  thirteen 
  years 
  devoted 
  his 
  chief 
  energies 
  to 
  the 
  

   study 
  of 
  the 
  material 
  collected 
  on 
  the 
  expedition 
  and 
  to 
  the 
  

   preparation 
  of 
  the 
  reports 
  mentioned. 
  His 
  labors, 
  however, 
  

   were 
  not 
  limited 
  to 
  this 
  field, 
  for 
  during 
  the 
  same 
  period, 
  he 
  

   prepared 
  and 
  issued 
  three 
  editions 
  of 
  the 
  System 
  of 
  Mineralogy 
  

   (1844, 
  1850, 
  1854) 
  and 
  two 
  editions 
  of 
  the 
  Manual 
  of 
  Min- 
  

   eralogy 
  (1848, 
  1857), 
  besides 
  writing 
  numerous 
  papers 
  for 
  this 
  

   and 
  other 
  scientific 
  periodicals. 
  

  

  From 
  1842 
  to 
  1844, 
  he 
  resided 
  in 
  Washington, 
  and 
  later 
  in 
  

   E"ew 
  Haven. 
  On 
  June 
  5, 
  1844, 
  he 
  married 
  Miss 
  Henrietta 
  

   Frances, 
  third 
  daughter 
  of 
  Professor 
  Benjamin 
  Silliman, 
  whose 
  

   assistant 
  he 
  had 
  been 
  in 
  1836-37, 
  and 
  with 
  whom 
  he 
  was 
  from 
  

   this 
  time 
  closely 
  associated 
  in 
  scientific 
  work. 
  

  

  The 
  labor 
  on 
  the 
  material 
  from 
  the 
  Exploring 
  Expedition 
  

   was 
  carried 
  forward 
  with 
  the 
  enthusiastic 
  zeal 
  of 
  an 
  earnest 
  

   student 
  with 
  a 
  new 
  world 
  open 
  before 
  him, 
  and 
  who 
  was 
  but 
  

   little 
  restrained 
  by 
  the 
  thought 
  that 
  injury 
  to 
  health 
  was 
  

   possible. 
  How 
  severe 
  and 
  intense 
  the 
  labor 
  of 
  this 
  period 
  

   was 
  will 
  be 
  evident 
  from 
  the 
  fact 
  that 
  a 
  few 
  years 
  after 
  the 
  

   last 
  Report 
  was 
  published, 
  Mr. 
  Dana's 
  health 
  broke 
  down, 
  and 
  

   so 
  completely 
  that 
  though 
  he 
  lived 
  thirty-five 
  years 
  after 
  this 
  

   and 
  accomplished 
  a 
  wonderful 
  amount 
  of 
  scientific 
  work, 
  life 
  

   was 
  from 
  this 
  time 
  ever 
  a 
  struggle 
  and, 
  not 
  always 
  with 
  success, 
  

   against 
  physical 
  disability. 
  

  

  In 
  1846, 
  Mr. 
  Dana 
  was 
  made 
  an 
  editor 
  of 
  this 
  Journal, 
  asso- 
  

   ciated 
  with 
  Professor 
  Benjamin 
  Silliman, 
  who 
  had 
  founded 
  it 
  

   twenty-eight 
  years 
  before, 
  and 
  with 
  his 
  son, 
  Professor 
  Benjamin 
  

   Silliman, 
  Jr. 
  His 
  labors 
  in 
  connection 
  with 
  the 
  Journal 
  con- 
  

   tinued 
  until 
  the 
  close 
  of 
  his 
  life. 
  

  

  In 
  1850, 
  Mr. 
  Dana 
  was 
  appointed 
  Professor 
  of 
  Natural 
  His- 
  

   tory 
  in 
  Yale 
  College, 
  and 
  in 
  1864 
  the 
  title 
  was 
  changed 
  to 
  that 
  

   of 
  Professor 
  of 
  Geology 
  and 
  Mineralogy. 
  His 
  duties 
  as 
  instruc- 
  

   tor, 
  however, 
  he 
  did 
  not 
  take 
  up 
  until 
  1855, 
  but, 
  after 
  this 
  

   date, 
  with 
  some 
  interruptions 
  due 
  to 
  ill 
  health, 
  as 
  more 
  partic- 
  

   ularly 
  noted 
  later, 
  his 
  active 
  connection 
  with 
  the 
  college 
  con- 
  

   tinued 
  until 
  1890. 
  It 
  is 
  perhaps 
  interesting 
  to 
  add 
  that 
  just 
  

   before 
  his 
  appointment 
  to 
  Yale 
  in 
  1850, 
  he 
  had 
  been 
  invited 
  to 
  

   a 
  similar 
  position 
  at 
  Cambridge, 
  Massachusetts, 
  in 
  connection 
  

  

  