﻿1875.] 
  On 
  Magnetical 
  Observations 
  in 
  Little 
  Namaqualand. 
  553 
  

  

  Silica 
  38-830 
  

  

  Alumina 
  13-250 
  

  

  Protoxide 
  of 
  iron 
  13*830 
  

  

  Peroxide 
  of 
  iron 
  4*335 
  

  

  Lime 
  3*925 
  

  

  Magnesia 
  4*180 
  

  

  Potash 
  -422 
  

  

  Soda 
  -971 
  

  

  Carbonic 
  acid 
  9*320 
  

  

  Water 
  11*010 
  

  

  100*073 
  

  

  Although 
  Professor 
  Jukes 
  expresses 
  himself 
  as 
  confident 
  of 
  the 
  origin 
  

   of 
  this 
  substance, 
  he 
  nowhere 
  had 
  an 
  opportunity 
  of 
  examining 
  it 
  in 
  con- 
  

   tact 
  with 
  basalt 
  previous 
  to 
  its 
  alteration. 
  The 
  presence 
  of 
  carbonic 
  

   acid 
  and 
  water 
  he 
  ascribes 
  to 
  subsequent 
  infiltration. 
  

  

  XV. 
  u 
  Results 
  of 
  Magnetical 
  Observations 
  made 
  in 
  Little 
  Nama- 
  

   qualand 
  during 
  a 
  part 
  of 
  the 
  Months 
  of 
  April 
  and 
  May, 
  1874.'''' 
  

   By 
  E. 
  J. 
  Stone, 
  M.A., 
  F.R.S. 
  Received 
  June 
  11, 
  1875. 
  

  

  An 
  eclipse 
  of 
  the 
  sun 
  was 
  to 
  occur 
  on 
  April 
  16, 
  1874, 
  which 
  would 
  

   be 
  total 
  throughout 
  Little 
  Namaqualand. 
  I 
  made 
  arrangements 
  for 
  a 
  

   visit 
  to 
  this 
  country 
  to 
  observe 
  the 
  eclipse. 
  The 
  country 
  is 
  one 
  rarely 
  

   visited. 
  I 
  was 
  not 
  aware 
  that 
  any 
  determinations 
  of 
  the 
  magnetic 
  

   elements 
  had 
  been 
  made 
  there, 
  except 
  a 
  few 
  of 
  the 
  variation 
  by 
  the 
  

   Admiralty 
  surveyors 
  at 
  one 
  or 
  two 
  points 
  along 
  the 
  coast. 
  It 
  appeared 
  

   to 
  me 
  desirable 
  that 
  the 
  opportunity 
  afforded 
  by 
  my 
  visit 
  to 
  observe 
  the 
  

   eclipse 
  should 
  not 
  be 
  lost 
  of 
  securiug 
  magnetical 
  observations 
  at 
  several 
  

   stations 
  in 
  Namaqualand. 
  An 
  application 
  was 
  made 
  to 
  the 
  Colonial 
  

   Government 
  for 
  some 
  assistance. 
  An 
  ox-waggon 
  was 
  required 
  for 
  the 
  

   transit 
  of 
  the 
  magnetical 
  equipment 
  and 
  of 
  a 
  wooden 
  building 
  which 
  had 
  

   been 
  prepared 
  to 
  protect 
  the 
  instruments 
  and 
  the 
  observers 
  whilst 
  at 
  

   work. 
  The 
  sum 
  asked 
  for 
  w 
  T 
  as 
  sixty 
  pounds. 
  The 
  request 
  thus 
  made 
  

   was, 
  however, 
  refused, 
  although 
  with 
  great 
  courtesy 
  and 
  apparent 
  reluc- 
  

   tance, 
  from 
  a 
  supposed 
  difficulty 
  in 
  passing 
  such 
  a 
  grant 
  through 
  Par- 
  

   liament. 
  I 
  was, 
  however, 
  most 
  unwilling 
  to 
  abandon 
  the 
  idea 
  of 
  making 
  

   these 
  magnetical 
  observations. 
  When 
  the 
  facts 
  of 
  the 
  case 
  became 
  known, 
  

   I 
  received 
  off 
  ers 
  of 
  assistance 
  from 
  some 
  gentlemen 
  in 
  Namaqualand, 
  and 
  

   His' 
  Excellency 
  Sir 
  Henry 
  Barkly, 
  K.C.B. 
  &c, 
  kindly 
  interested 
  himself 
  

   in 
  the 
  matter 
  and 
  afforded 
  me 
  all 
  the 
  facilities 
  in 
  his 
  power. 
  I 
  deter- 
  

   mined 
  therefore 
  to 
  carry 
  out, 
  in 
  a 
  somewhat 
  modified 
  form, 
  the 
  scheme 
  

   of 
  observations 
  which 
  I 
  had 
  arranged. 
  The 
  wooden 
  building 
  was 
  left 
  

   behind. 
  I 
  found 
  that 
  good 
  observations 
  could 
  be 
  made 
  without 
  cover 
  of 
  

  

  