﻿814 
  Dr. 
  Coleridge 
  Farr 
  and 
  Mr. 
  Florance 
  on 
  tJie 
  Radium 
  

  

  per 
  gramme 
  of 
  rock. 
  We 
  therefore 
  consider 
  that 
  for 
  the 
  

   specimens 
  we 
  have 
  examined 
  the 
  results 
  may 
  be 
  relied 
  upon 
  

   to 
  about 
  this 
  extent. 
  

  

  Residts. 
  

  

  Granite. 
  Bounty 
  Is. 
  2-50x10-12 
  

  

  Trachyte. 
  Auckland 
  Is., 
  Musgrave 
  Pen 
  in. 
  2' 
  10 
  

  

  Granite. 
  Auckland 
  Is., 
  Musgrave 
  Penin. 
  1*01 
  

  

  Pitchstone. 
  Auckland 
  Is., 
  Musgrave 
  Penin. 
  1*9 
  

  

  Basic 
  Por- 
  Auckland 
  Is., 
  Adams 
  Island. 
  0*99 
  

  

  phyrite. 
  

  

  Basalt. 
  Auckland 
  Is., 
  Adams 
  Is. 
  (sea- 
  0*81 
  

  

  level). 
  

  

  Dolerite. 
  Auckland 
  Is.. 
  Adams 
  Is. 
  (top). 
  0*52 
  

  

  Diabase. 
  Auckland 
  Is., 
  Musgrave 
  Penin. 
  0"43 
  

  

  Gabbro. 
  Auckland 
  Is., 
  McClure 
  Head, 
  0'33 
  

  

  Carnley. 
  

  

  Campbell 
  Island 
  Rocks 
  : 
  — 
  

  

  Porphyry. 
  Perseverance 
  Harbour 
  2'^ 
  

  

  Trachvte. 
  Filial 
  Point 
  2*64 
  

  

  Trachyte. 
  Mount 
  Lyell 
  1-58 
  

  

  Melilite 
  Mount 
  Lyell 
  1-61 
  

  

  Basalt. 
  

  

  Dolerite. 
  Mount 
  Honey 
  0-79 
  

  

  Limestone. 
  Garden 
  Cove 
  0'46 
  

  

  Gabbro. 
  N.W.Bay 
  0*34 
  

  

  Marble. 
  N.W.Bay 
  0*28 
  

  

  The 
  three 
  following 
  rocks 
  are 
  of 
  special 
  interest: 
  — 
  

  

  (1) 
  Andesite 
  from 
  the 
  latest 
  flow 
  of 
  Ngauruhoe. 
  about 
  

  

  sixty 
  years 
  old. 
  Radium 
  content 
  '41. 
  

  

  (2) 
  A 
  lava 
  from 
  the 
  lip 
  of 
  the 
  crater 
  of 
  Mount 
  Erebus. 
  

  

  This 
  is 
  fairly 
  recent, 
  and 
  was 
  given 
  us 
  by 
  Mr. 
  D. 
  

   Mawson, 
  of 
  the 
  Nimrod 
  Expedition. 
  Radium 
  con- 
  

   tent 
  2-38. 
  

   This 
  rock 
  has 
  had 
  to 
  be 
  tested 
  rather 
  hurriedly, 
  and 
  is 
  

   perhaps 
  under 
  true 
  value. 
  

  

  (3) 
  The 
  Meteorite 
  is 
  a 
  stony 
  meteorite 
  which 
  fell 
  at 
  

  

  Mokoia 
  in 
  New 
  Zealand, 
  on 
  November 
  26th, 
  1908, 
  

   and 
  was 
  sent 
  to 
  us 
  by 
  Mr. 
  G. 
  R. 
  Marriner, 
  Curator 
  

   of 
  the 
  Wanganui 
  Museum. 
  It 
  contains 
  37 
  per 
  cent, 
  

   of 
  iron 
  oxide, 
  and 
  37*5 
  per 
  cent, 
  of 
  silica. 
  Radium 
  

   content 
  '52. 
  This 
  value 
  is 
  nearly 
  equal 
  to 
  that 
  

   obtained 
  by 
  Strutt 
  for 
  a 
  stony 
  meteorite. 
  

  

  Conclusions. 
  — 
  Since 
  all 
  but 
  two 
  of 
  the 
  rocks 
  examined 
  are 
  

   derived 
  from 
  islands 
  to 
  the 
  south 
  of 
  New 
  Zealand 
  which 
  

  

  