﻿352 
  Scientific 
  Intelligence. 
  

  

  York 
  1897 
  (The 
  Macmillan 
  Co. 
  ; 
  price 
  $1.40).— 
  The 
  author 
  has 
  

   here 
  attempted 
  to 
  present 
  the 
  subject 
  of 
  geology 
  in 
  a 
  form 
  suit- 
  

   able 
  for 
  the 
  comprehension 
  of 
  quite 
  elementary 
  students; 
  he 
  

   dwells 
  especially 
  upon 
  the 
  dynamical 
  side 
  of 
  the 
  subject, 
  rightly 
  

   regarding 
  the 
  full 
  treatment 
  of 
  historical 
  and 
  stratigraphical 
  

   geology 
  as 
  belonging 
  to 
  an 
  advanced 
  course 
  of 
  study. 
  In 
  many 
  

   respects 
  he 
  has 
  done 
  his 
  work 
  well, 
  but 
  it 
  is 
  to 
  be 
  regretted 
  that 
  

   he 
  has 
  allowed 
  himself 
  to 
  be 
  careless 
  in 
  writing 
  at 
  a 
  number 
  of 
  

   points, 
  and, 
  moreover, 
  that 
  occasional 
  errors 
  in 
  the 
  names 
  of 
  fossils 
  

   and 
  other 
  blemishes 
  come 
  in, 
  which 
  are 
  unfortunate 
  in 
  the 
  case 
  of 
  

   a 
  book 
  which 
  is 
  to 
  go 
  into 
  the 
  hands 
  of 
  young 
  students. 
  

  

  It 
  is 
  hardly 
  allowable, 
  for 
  example, 
  even 
  in 
  popular 
  language, 
  to 
  

   speak 
  of 
  coral 
  mud 
  as 
  " 
  clay." 
  Further, 
  the 
  proper 
  use 
  of 
  such 
  

   terms 
  as 
  period, 
  age, 
  epoch, 
  etc., 
  in 
  geological 
  chronology, 
  is 
  a 
  

   matter 
  to 
  which 
  geologists 
  have 
  given 
  much 
  thought, 
  and 
  it 
  is 
  

   unfortunate 
  that 
  they 
  should 
  be 
  used 
  by 
  the 
  author 
  with 
  so 
  little 
  

   discrimination, 
  different 
  terms 
  being 
  used 
  for 
  the 
  same 
  divisions 
  

   even 
  in 
  the 
  course 
  of 
  a 
  single 
  sentence. 
  Other 
  points 
  might 
  be 
  

   mentioned; 
  for 
  example, 
  on 
  page 
  410, 
  No. 
  1 
  of 
  fig. 
  235 
  is 
  called 
  a 
  

   u 
  brachiopod" 
  but 
  is 
  named 
  "Aulopora 
  arachnoidia" 
  ; 
  the 
  latter 
  

   perhaps 
  referring 
  to 
  the 
  label, 
  and 
  the 
  former 
  to 
  the 
  specimen 
  with 
  

   which 
  it 
  was 
  found. 
  

  

  The 
  author 
  has 
  evidently 
  made 
  an 
  effort 
  to 
  secure 
  original 
  illus- 
  

   trations 
  on 
  a 
  liberal 
  scale, 
  and 
  many 
  of 
  the 
  reproductions 
  from 
  

   photographs 
  can 
  be 
  highly 
  commended, 
  but 
  not 
  a 
  few 
  of 
  the 
  

   figures, 
  especially 
  in 
  the 
  early 
  part 
  of 
  the 
  book, 
  bear 
  (as 
  printed) 
  

   little 
  or 
  no 
  resemblance 
  to 
  the 
  objects 
  which 
  they 
  are 
  designed 
  

   to 
  illustrate. 
  The 
  fossils, 
  too, 
  which 
  are 
  figured 
  in 
  the 
  latter 
  part 
  

   of 
  the 
  book 
  are 
  poorly 
  selected 
  and 
  give 
  but 
  little 
  indication 
  of 
  

   the 
  distinguishing 
  characters 
  which 
  they 
  are 
  intended 
  to 
  represent. 
  

  

  10. 
  A 
  Catalogue 
  of 
  the 
  Minerals 
  of 
  Tasmania 
  ; 
  by 
  W. 
  F. 
  

   Petterd. 
  103 
  pp. 
  Launceston, 
  1896. 
  — 
  This 
  catalogue 
  is 
  an 
  ex- 
  

   tension 
  of 
  an 
  earlier 
  one 
  published 
  in 
  1893. 
  It 
  enumerates 
  some 
  

   269 
  species 
  which 
  have 
  thus 
  far 
  been 
  identified 
  among 
  the 
  mineral 
  

   products 
  of 
  Tasmania. 
  Among 
  these 
  are 
  a 
  number 
  of 
  consider- 
  

   able 
  rarity, 
  as 
  crocoite, 
  vauquelinite, 
  eudialyte, 
  etc., 
  which 
  it 
  is 
  

   interesting 
  to 
  learn 
  of 
  as 
  occurring 
  in 
  a 
  new 
  locality. 
  We 
  note 
  

   the 
  following 
  names 
  which 
  are 
  now 
  introduced 
  into 
  the 
  science. 
  

   Dundasite, 
  from 
  a 
  qualitative 
  analysis, 
  is 
  inferred 
  to 
  be 
  a 
  

   hyd 
  rated 
  carbonate 
  and 
  phosphate 
  of 
  lead 
  and 
  aluminum. 
  It 
  

   forms 
  small 
  spherical 
  aggregates 
  with 
  radiated 
  structure, 
  and 
  is 
  

   milky 
  white 
  in 
  color, 
  except 
  on 
  the 
  surface, 
  which 
  is 
  yellow- 
  

   brown. 
  It 
  was 
  obtained 
  from 
  the 
  Adelaide 
  mine, 
  Dundas. 
  Heazle- 
  

   Woodite 
  is 
  a 
  sulphide 
  of 
  nickel 
  and 
  iron, 
  related 
  to 
  pentlandite 
  

   but 
  apparently 
  not 
  to 
  be 
  identified 
  with 
  it. 
  According 
  to 
  some 
  

   assays, 
  it 
  contains 
  38^ 
  of 
  nickel. 
  Weldite 
  is 
  a 
  silicate 
  of 
  alumi- 
  

   num 
  and 
  sodium 
  from 
  the 
  Weld 
  River. 
  It 
  occurs 
  in 
  white 
  masses 
  : 
  

   hardness 
  — 
  5*5 
  ; 
  specific 
  gravity 
  = 
  2'98. 
  It 
  was 
  announced 
  by 
  F. 
  

   M. 
  Krause 
  in 
  1884. 
  

  

  11. 
  The 
  Production 
  of 
  Precious 
  Stones 
  in 
  1895 
  ; 
  by 
  George 
  

  

  