﻿192 
  Prof. 
  J. 
  Joly 
  on 
  the 
  Radium-Content 
  

  

  The 
  weights 
  of 
  material 
  used 
  in 
  the 
  several 
  experiments 
  are 
  

   not 
  corrected 
  for 
  contained 
  hygroscopic 
  moisture. 
  The 
  

   substances 
  are 
  weighed 
  " 
  air-dry," 
  except 
  in 
  the 
  cases 
  of 
  the 
  

   calcareous 
  mud 
  and 
  the 
  green 
  sand, 
  which 
  were 
  dried 
  over 
  

   the 
  water-bath. 
  The 
  radium 
  is 
  in 
  each 
  case 
  recorded 
  in 
  

   billionths 
  of 
  a 
  gram 
  per 
  gram 
  of 
  material 
  examined. 
  

  

  Blue 
  Mud. 
  Chall. 
  Station, 
  45. 
  Lat. 
  38° 
  34/ 
  K, 
  long. 
  12 
  

   10' 
  W. 
  1240 
  fathoms. 
  (Off 
  the 
  east 
  coast 
  of 
  N. 
  

   America.) 
  

  

  This 
  deposit 
  contains 
  a 
  considerable 
  proportion 
  of 
  small 
  

   rounded 
  pebbles 
  and 
  sand, 
  composed 
  mainly 
  of 
  

   quartz. 
  

   On 
  S'S6 
  grains 
  treated 
  according 
  to 
  method 
  0. 
  

   Radium 
  3*1. 
  

  

  Terriginous 
  Mud 
  elevated 
  by 
  mud 
  volcano 
  9 
  miles 
  N.W. 
  of 
  

   Oheduba 
  Island, 
  coast 
  of 
  Arakan, 
  Bay 
  of 
  Bengal 
  ; 
  

   Dec. 
  1906. 
  

  

  For 
  an 
  account 
  of 
  this 
  temporary 
  island 
  see 
  * 
  Nature 
  ' 
  

  

  of 
  Feb. 
  28 
  and 
  March 
  14, 
  1907. 
  

   On 
  10 
  grains 
  by 
  method 
  A. 
  

   Radium 
  2*9. 
  

  

  Green 
  Sand. 
  S.s. 
  ' 
  Albatross/ 
  Locality 
  not 
  given. 
  

   On 
  9 
  grains 
  by 
  method 
  A. 
  

   Radium 
  4*5. 
  

  

  Globergina 
  Ooze 
  (from 
  Mr. 
  Kemp). 
  Lat. 
  51° 
  37 
  ; 
  N., 
  long. 
  

   12° 
  5' 
  to 
  12° 
  14' 
  W. 
  557 
  to 
  579 
  fathoms. 
  (Brought 
  up 
  

   in 
  trawling 
  off 
  west 
  coast 
  of 
  Ireland.) 
  

  

  This 
  Ooze 
  is 
  not 
  quite 
  free 
  from 
  mineral 
  detritus 
  

   derived 
  from 
  the 
  land. 
  

  

  (1) 
  On 
  20 
  grams 
  by 
  method 
  B 
  (soluble 
  parts 
  1 
  1 
  grams) 
  . 
  

   Radium 
  per 
  gram 
  of 
  whole 
  quantity 
  6*0. 
  

  

  (2) 
  On 
  10 
  grams 
  by 
  method 
  A 
  (all 
  in 
  solution). 
  

   Radium 
  6*6. 
  

  

  Gloligenna 
  Ooze. 
  Chall. 
  Station, 
  338. 
  Lat. 
  21°13'S. 
  J 
  long. 
  

   14° 
  2' 
  W. 
  1990 
  fathoms. 
  (Middle 
  of 
  South 
  Atlantic!) 
  

  

  (1) 
  On 
  25 
  grams 
  by 
  method 
  B 
  (soluble 
  part 
  22*25 
  

   grams). 
  

  

  Radium 
  6*4. 
  

  

  (2) 
  Same 
  : 
  Oil 
  fusing 
  insoluble 
  part 
  and 
  adding 
  to 
  acid, 
  

   extract. 
  

  

  Radium 
  6*7, 
  

  

  