﻿322 
  Scientific 
  Intelligence. 
  

  

  being 
  nearly 
  1,000 
  fathoms 
  in 
  depth; 
  that 
  the 
  strait 
  between 
  

   Cuba 
  and 
  Haiti, 
  is 
  slightly 
  more 
  shallow, 
  being 
  only 
  about 
  875 
  

   fathoms, 
  while 
  the 
  one 
  between 
  the 
  latter 
  islands 
  and 
  Puerto 
  

   Rico 
  carries 
  but 
  260 
  fathoms. 
  Supposing 
  these 
  islands 
  to 
  have 
  

   been 
  united 
  at 
  a 
  former 
  time, 
  then, 
  during 
  a 
  period 
  of 
  gradual 
  

   subsidence, 
  Jamaica 
  would 
  be 
  separated 
  sometime 
  before 
  the 
  rest 
  

   of 
  the 
  Antillian 
  island 
  would 
  be 
  broken 
  up; 
  then 
  Cuba 
  would 
  be 
  

   isolated, 
  while 
  Haiti 
  and 
  Puerto 
  Rico 
  would 
  remain 
  united 
  for 
  a 
  

   longer 
  time. 
  The 
  distribution 
  and 
  character 
  of 
  the 
  land-snail 
  

   faunas 
  of 
  these 
  islands 
  agree 
  exactly 
  with 
  just 
  what 
  would 
  be 
  the 
  

   result 
  of 
  such 
  a 
  subsidence 
  and 
  separation. 
  

  

  2. 
  Glacial 
  phenomena 
  Northivest 
  and 
  West 
  of 
  Hudson 
  Bay. 
  — 
  

   Mr. 
  J. 
  B. 
  Tyrrell, 
  of 
  the 
  Canada 
  Geological 
  Survey, 
  concludes, 
  

   after 
  an 
  examination 
  of 
  the 
  region 
  on 
  the 
  northwest 
  and 
  west 
  of 
  

   Hudson 
  Bay, 
  and 
  especially 
  from 
  the 
  direction 
  of 
  the 
  glacial 
  

   scratches, 
  that 
  within 
  a 
  comparatively 
  short 
  distance 
  of 
  the 
  

   northern 
  portion 
  of 
  the 
  bay, 
  there 
  was 
  u 
  one 
  of 
  the 
  great 
  gather- 
  

   ing 
  grounds 
  for 
  the 
  snow 
  of 
  the 
  Glacial 
  period 
  ;" 
  and 
  that 
  from 
  

   the 
  ice-plateau 
  thus 
  made, 
  the 
  movement 
  of 
  the 
  ice 
  was 
  eastward, 
  

   into 
  the 
  Hudson 
  Bay 
  depression, 
  northward 
  toward 
  the 
  Arctic 
  

   Ocean, 
  and 
  a 
  long 
  distance 
  westward 
  toward 
  the 
  Mackenzie 
  

   River. 
  There 
  was 
  also 
  a 
  southward 
  movement 
  " 
  toward 
  the 
  great 
  

   plains. 
  At 
  this 
  time 
  Hudson 
  Bay 
  was 
  probably 
  to 
  a 
  great 
  

   extent 
  open 
  water." 
  

  

  After 
  the 
  recession 
  of 
  the 
  ice 
  from 
  the 
  lower 
  country, 
  the 
  land 
  

   was 
  about 
  400 
  feet 
  below 
  its 
  present 
  level. 
  There 
  are 
  terraces 
  at 
  

   different 
  heights 
  about 
  the 
  lakes. 
  Those 
  of 
  Aberdeen 
  Lake 
  have 
  

   the 
  heights 
  290, 
  220, 
  180, 
  150, 
  105, 
  90 
  and 
  60 
  feet 
  above 
  it. 
  

   Similar 
  terraces 
  are 
  found 
  in 
  favorable 
  localities 
  all 
  along 
  the 
  

   shores 
  of 
  Hudson 
  Bay. 
  

  

  3. 
  Faidts 
  of 
  post- 
  Glacial 
  origin. 
  — 
  In 
  Bulletin 
  XII 
  of 
  the 
  

   Natural 
  History 
  Society 
  of 
  New 
  Brunswick 
  (p. 
  34) 
  Dr. 
  G. 
  F. 
  

   Matthew 
  describes 
  small 
  faults 
  observed 
  by 
  him 
  over 
  a 
  consider- 
  

   able 
  area 
  in 
  the 
  ledges 
  of 
  slate 
  near 
  St. 
  John. 
  The 
  relations 
  of 
  

   the 
  faults 
  to 
  the 
  glacial 
  striae 
  indicates 
  that 
  they 
  are 
  post-Glacial. 
  

   Their 
  courses 
  vary 
  ; 
  but 
  at 
  St. 
  John 
  the 
  greatest 
  throws 
  and 
  the 
  

   most 
  frequent 
  have 
  a 
  northeast 
  to 
  southwest 
  course, 
  and 
  the 
  more 
  

   the 
  joints 
  depart 
  from 
  this 
  course 
  the 
  less 
  is 
  the 
  displacement; 
  

   rarely 
  any 
  occur 
  at 
  right 
  angles 
  to 
  it. 
  The 
  displacements 
  

   observed 
  are 
  mostly 
  between 
  half 
  an 
  inch 
  and 
  ten 
  inches. 
  Dr. 
  

   Matthews 
  regards 
  it 
  as 
  probable 
  that 
  the 
  faulting 
  is 
  due 
  to 
  lateral 
  

   pressure 
  from 
  the 
  southeast. 
  

  

  4. 
  Pre- 
  Cambrian 
  Kadiolarians. 
  — 
  The 
  paper 
  of 
  L. 
  Cayettx, 
  on 
  

   Radiolarians 
  in 
  the 
  pre-Cambrian 
  rocks 
  of 
  Brittany 
  (Bull. 
  Soc. 
  

   Geol. 
  de 
  France, 
  1894, 
  p. 
  19V) 
  is 
  accompanied 
  by 
  a 
  plate 
  giving 
  

   figures 
  of 
  45 
  of 
  the 
  forms 
  observed. 
  The 
  figures 
  appear 
  to 
  sus- 
  

   tain 
  fully 
  the 
  author's 
  conclusion 
  as 
  to 
  the 
  Radiolarian 
  character 
  

   of 
  the 
  organisms. 
  He 
  describes 
  them 
  as 
  having 
  generally 
  a 
  dis- 
  

   tinct 
  outer 
  shell, 
  which 
  is 
  pierced 
  by 
  pores. 
  The 
  age 
  of 
  the 
  rocks 
  

   is 
  pronounced 
  pre-Cambrian 
  by 
  Barrois. 
  They 
  are 
  quartzites, 
  

  

  